BMW Engine Parts for BMW E30 M3 S14 2.3L

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Turner Motorsport has everything you need to upgrade your BMW through our stages of performance or to keep your car in peak condition with our range of the latest in proven OEM cooling parts. Upgrade your cooling system and engine performance with the selections below to give your BMW a performance and reliability advantage.

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Belt - Air Conditioner - E30 E28 - M20 Engine - 13x810mm
For vehicles with production date up to 03/1992
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Continental - Corporate Logo
T#:1451
Part#: 13X810
In Stock
$ 9.47 USD
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$ 9.47 USD
Free Shipping on orders $49 and up
This belt drives the air conditioning compressor on many (see list) M20 6 cylinder engines. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are causing noise, it's time for new belts.

This air conditioning belt (13x810mm) fits the following BMWs:
1984-1985 E30 325, 325e, 325es
1984-1988 E28 528e
1984-1986 E28 524td
1989-1990 E34 525i (M20 single cam engine)
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Combination Feeler Gauge/Spark Plug Gapping Tool
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Gear Wrench - Corporate Logo
T#:587003
Part#: KDT164
In Stock
$ 10.99 USD
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Gauge and accurately alter the gap of your spark plugs.
4 Piece Mini hook & Pick Set
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Lisle - Corporate Logo
T#:5512197
Part#: 31750
In Stock
$ 13.99 USD
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Works Great for Removing Hoses, Moldings, Clips, Clamps, Seals, O-Rings, Cotter Pins, and Gaskets.

Genuine BMW Hex Screw With Collar - 31106797237
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Genuine BMW - Corporate Logo
T#:54035
Part#: 31106797237
In Stock
5% off MSRP $ 8.27

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 7.88 USD
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5% off MSRP
$ 8.27

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 7.88 USD
Free Shipping on orders $49 and up


Genuine BMW Hex Screw With Collar - M12X1,5X85-10.9
This item fits the following BMW Chassis:
E90,E92,F22,F30,F31,F32,F33,F34,F36,F80 M3,F82 M4,F83


Victor Reinz Oil Drain Plug Crush Washer - Multiple BMWs & MINIs ...
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Victor Reinz - Corporate Logo
T#:340629
Part#: 07119963151
In Stock
$ 2.99 USD
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Replace your oil drain plug sealing washer ever oil change to prevent the chance of oil leaks and a stained driveway.
Shifter Rebuild Hardware Kit
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Genuine BMW - Corporate Logo
T#:55209882
Part#: 07119905KT
Ships in 1-2 days
New Item
$ 4.80 USD
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ARP Ultra-Torque Fastener Assembly Lubricant (Select Your Size) ...
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ARP - Corporate Logo
T#:338571
Part#: TMS1733
In Stock
Starting at $ 1.99 USD
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Starting at $ 1.99 USD
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If you are using a premium fastener, such as the ARP brand rod bolts, head bolts, or main bolts, then you will want this assembly lube. Made to be used to precisely duplicate all ARP fastener preload specifications.
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Feeler Gauge Set
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Performance Tool - Corporate Logo
T#:1809138
Part#: W125C
Ships in 1 Business Day
$ 9.99 USD
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Thickness Gauge (32 Blades)

Elring Rear Engine Seal - E30, E32, E34, E36, E39, E46, E53, E60, E83...
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Elring - Corporate Logo
T#:580020
Part#: 702.994
In Stock
$ 20.99

This product was last offered at the strikethrough price on
06-26-2026

$ 17.99 USD
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$ 17.99 USD
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Replace when doing clutch job

Elring Camshaft Seal - E23, E24, E28, E30, E31, E32, E34, E38 ...
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Elring - Corporate Logo
T#:579922
Part#: 562.939
In Stock at Vendor
$ 10.99

This product was last offered at the strikethrough price on
05-07-2026

$ 9.99 USD
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$ 9.99 USD
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Oil Seal for the camshaft
CSF Universal Large Single-Pass Oil Cooler - Universal Application ...
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Universal fitment design - modifications may be necessary to run this cooler
CSF - Corporate Logo
T#:53608839
Part#: 8371
Ships in 3 Business Days
New Item
$ 499.00 USD
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$ 499.00 USD
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CSF redesigned this cooler and went with a more traditional inlet/outlet orientation. The new single pass design features high efficiency and high durability, but with vertically oriented inlet and outlet connections.
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Universal Vortex Breather Catch Can
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034Motorsport - Corporate Logo
T#:587831
Part#: 034-101-4000
Ships in 2 Business Days
Sale - Save 10% $ 153.00

This product was last offered at the strikethrough price on
06-28-2026

$ 137.70 USD
Free Shipping
Sale - Save 10%
$ 153.00

This product was last offered at the strikethrough price on
06-28-2026

$ 137.70 USD
Free Shipping


Fuel Injector Clinic 650cc Fuel Injector - Set of 4
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Fuel Injector Clinic - Corporate Logo
T#:6940367
Part#: IS803-0650H
Ships in 1 Business Day
$ 378.00 USD
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$ 378.00 USD
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High performance fuel injectors featuring high impedance Bosch core, E85 compatible, with a lifetime warranty. This injector set is precisely matched using Fuel Injector Clinic's proprietary Data Match Technology. Each injector is individually serial numbered and the results are provided on the Data Match Sheet providing the most complete flow matching and latency value information available in the industry today. Fuel Injector Clinic injectors are flow tested and rated at 43.5psi (3Bar) at 90deg F fuel temperature using CF-16B calibration fluid. A superior short pulse width control and state of the art matching make these injectors easy to tune and provide great drivability. Every injector is covered against failure caused by defects in original manufacture by a lifetime warranty.
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15A Fuse - Priced Each
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Bosch - Corporate Logo
T#:375327
Part#: 61131372626
In Stock at Vendor
$ 2.03 USD
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Denso Iridium Spark Plug - Priced Each - E30 E34 E24, M3 M5 M6 ...
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Denso - Corporate Logo
T#:641777
Part#: 5375
Ships in 1 Business Day
$ 12.71 USD
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URO Oil Filler Cap - Multiple BMW Fitments
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URO - Corporate Logo
T#:37757278
Part#: 11121716993
Ships in 1 Business Day
$ 6.61 USD
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URO Oil Filler Cap - Multiple BMW Fitments

URO Oil Filler Cap - Multiple BMW Fitments is a premium replacement designed to restore a secure seal on your BMW’s engine. A missing, cracked, or broken oil filler cap can lead to oil leaks, contamination, and reduced engine efficiency. This OE-style cap ensures a perfect fit, maintaining the original look of your engine bay while preventing oil seepage. Manufactured from high-quality, heat-resistant materials, it withstands extreme engine temperatures and exposure to oil vapors. With a hassle-free installation process and a 24 Month Unlimited Mileage Warranty, this cap provides long-lasting reliability.

  • Direct-fit replacement for a missing or damaged oil filler cap
  • Prevents oil leaks and contamination to maintain engine efficiency
  • OE dimensions ensure an exact fit and factory appearance
  • High-quality materials resist extreme heat and oil vapors
  • Quick and easy installation for hassle-free maintenance
  • Backed by a 24 Month Unlimited Mileage Warranty
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Dual End Scriber
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Gear Wrench - Corporate Logo
T#:641411
Part#: KDT2979
Ships in 6 Business Days
$ 10.99 USD
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Sharp, tempered point scribes metal
Elring Oil Pan Gasket - Upper - E10, E21, E30
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Elring - Corporate Logo
T#:348276
Part#: 11131727974
In Stock at Vendor
$ 12.99 USD
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A must when installing a new oil pan

ARP Head Stud Kit, BMW S14
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ARP - Corporate Logo
T#:28537451
Part#: ARP-HSK-S14
Ships in 3 Business Days
$ 179.99 USD
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This ARP head stud Kit is designed for the BMW S14 B20, S14B23, S14B25, S14B27 engines found in the E30 M3. Installing ARP head studs can provide several benefits, including increased clamping force, improved head gasket sealing, and greater overall engine strength. This is especially important in high-performance and racing applications where the engine is subjected to increased stress and higher temperatures. Before installing ARP head studs, it is important to properly clean and prepare the engine block and cylinder head mating surfaces. It is also recommended to use ARP Ultra-Torque Fastener Assembly Lubricant during installation to ensure proper torque and clamping force. Instructions: 1. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the block. Chase if necessary with ARP Thread Chaser. 2. Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damages, plus proper fit, length and dimension. 3. If the cylinder head studs protrude into a water jacket, lubricate the block threads of the studs with ARP THREAD SEALER. 4. Screw studs into the block “HAND TIGHT ONLY”. 5. Install the cylinder head(s) and check for binding or misalignment. 6. Lubricate the stud threads, nuts and washers with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT. Then install the washers and the nuts onto the studs and tighten them hand tight. ARP recommends using the ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT that is provided with each kit as opposed to motor oil. This is due to higher friction on the studs as well as inconsistencies in the clamping force of the fasteners when motor oil or other low quality lubricants are used.
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Victor Reinz Oil Pan Gasket - Lower - E30
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Victor Reinz - Corporate Logo
T#:582057
Part#: 11131727983
Ships in 1 Business Day
$ 18.31

This product was last offered at the strikethrough price on
07-07-2026

$ 18.27 USD
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$ 18.27 USD
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If your car is leaving oil on your driveway, it might be due to a failing Oil Pan Gasket. This gasket is a common leak source, so be sure to replace it if you are working on your oil pan or if you notice oil leaks.
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Athena Cut Ring Head Gasket S14
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5150 Autosport - Corporate Logo
T#:28537477
Part#: ATH-HG-CR-S14-95
Ships in 3 Business Days
$ 284.99 USD
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This Athena Cut Ring Head Gasket is specifically engineered to replace BMW part 11121316714 for the S14B20, S14B23, S14B25, S14B27 engines found in the E30 M3. Factory OEM & MLS head gaskets are only engineered to handle a limited amount of cylinder pressures before they start to leak, causing a range of issues, including engine overheating, loss of power, misfires, and in severe cases, catastrophic engine failure. Athena-SCE Cut Ring Head Gaskets are uniquely designed to handle increased cylinder pressure caused by power modifications, making them the recommended choice for applications making 16+ psi. Design: Athena-SCE's gasket body is composed of Motorgasket, a reinforced material developed by Athena's R&D department. This consists of a steel core covered with two layers of asbestos-free aramid fibre and offers excellent thermal and mechanical resistance without compromising its ability to adapt to mating surfaces. To ensure maximum sealing under all conditions, a silicone bead is also applied to critical sealing areas, such as oil and coolant passages. The AISI 304 stainless steel cooper rings bite into the aluminum head, providing maximum sealing around the cylinder bore and optimizing engine performance, even on engines with nitrous and/or turbo applications that exceed 2 bar boost.
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Fischer and Plath Drain Plug Sealing Washer - E46
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Fischer and Plath - Corporate Logo
T#:403883
Part#: 07119963151
In Stock at Vendor
$ 3.99

This product was last offered at the strikethrough price on
05-07-2026

$ 2.99 USD
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$ 2.99 USD
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A12x17-CU
URO Coolant Level Sensor - E24 E30 E32 E34
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URO - Corporate Logo
T#:593414
Part#: 61311378320
Ships in 1 Business Day
$ 17.99 USD
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$ 17.99 USD
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This sensor is critical in keeping tabs of your cooling system's health.
OEM Elring Camshaft Seal - BMW E30 E38 E28 E24
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Elring - Corporate Logo
T#:2706186
Part#: 11141271415
In Stock at Vendor
$ 8.99

This product was last offered at the strikethrough price on
07-05-2026

$ 8.26 USD
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$ 8.26 USD
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Replacement cam seal, located in the timing cover or the valve cover on some models


Rein Fuel Injector O-Ring - E23, E24, E28, E30, E31, E32, E34, E36, E...
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Rein - Corporate Logo
T#:362382
Part#: 13641730767
In Stock at Vendor
$ 6.17 USD
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Located on nozzle end of injector
Battery Tender Plus Advanced Battery Charging System
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Battery Tender - Corporate Logo
T#:49892371
Part#: BTT0210128
Back Ordered
New Item
$ 69.99 USD
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Piston Ring Installer
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Performance Tool - Corporate Logo
T#:1809133
Part#: W80575
Ships in 1 Business Day
$ 17.62 USD
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Comfortable vinyl grip handles.

4 Pc. Mini Hook & Pick Set
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Gear Wrench - Corporate Logo
T#:30164626
Part#: KDT84040H
Ships in 6 Business Days
$ 59.48 USD
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Features:

  • Versatile Shapes: Perfect for leveraging or pulling parts, springs, and cotter pins.
  • Easy Access: Designed to navigate around wiring, hoses, and other engine bay obstacles.
  • Durable Blade: Full polish alloy steel blade resists rust and corrosion.
  • Ergonomic Handle: Tri-lobe dual material handle ensures strength and efficiency.
  • Long-Lasting: Oil and solvent resistant handle extends tool life.
  • Complete Set: Includes mini full hook, 90° mini hook, mini straight hook, and mini offset hook.
  • Organized Storage: Comes with a pouch for easy storage and organization.
  • High Standards: Meets or exceeds ASME standards for performance and quality.


Includes:

  • Mini Full Hook
  • 90° Mini Hook
  • Mini Straight Hook
  • Mini Offset Hook
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Fuel Injector Clinic 525cc Fuel Injector - Set of 4
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Fuel Injector Clinic - Corporate Logo
T#:6940368
Part#: IS803-0525H
Ships in 1 Business Day
$ 352.00 USD
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$ 352.00 USD
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High performance fuel injectors featuring high impedance Bosch core, E85 compatible, with a lifetime warranty. This injector set is precisely matched using Fuel Injector Clinic's proprietary Data Match Technology. Each injector is individually serial numbered and the results are provided on the Data Match Sheet providing the most complete flow matching and latency value information available in the industry today. Fuel Injector Clinic injectors are flow tested and rated at 43.5psi (3Bar) at 90deg F fuel temperature using CF-16B calibration fluid. A superior short pulse width control and state of the art matching make these injectors easy to tune and provide great drivability. Every injector is covered against failure caused by defects in original manufacture by a lifetime warranty.
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General Purpose Hose Clamp - Priced Each
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Rein - Corporate Logo
T#:592737
Part#: 07129952104
Ships in 3 Business Days
$ 6.99 USD
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Race German Fuel Injector Filter Removal Tool
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Race German - Corporate Logo
T#:7703243
Part#: RGIJT0L
Ships in 2 Business Days
$ 17.99 USD
Free Shipping on orders $49 and up
Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. Race German's BMW fuel injector rebuild kit is one of their best selling products. To make things easier, they are now offering this little tool to help you remove the small micro filters out of the end of the Bosch fuel injectors. This simple tool threads into the end of the injector, and once engaged you simply wiggle and pull, and the micro filter comes out. *Note: This tool is included with many of the Race German Injector rebuild kits
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120 pc Fuse Assortment
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Performance Tool - Corporate Logo
T#:1809154
Part#: W5368
Ships in 1 Business Day
$ 13.68 USD
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A must for any toolbox.

Radium - Split-Flow Flex Fuel Sensor Adapter
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Radium Engineering - Corporate Logo
T#:53290958
Part#: 20-0589
In Stock at Vendor
New Item
$ 99.99 USD
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Oil Filter Housing Gasket Set
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URO - Corporate Logo
T#:591706
Part#: 11429059338
Ships in 1 Business Day
$ 12.99 USD
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Located at the top of the filter housing
Titan 4-Piece Air Blow Gun Set
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Titan - Corporate Logo
T#:797045
Part#: TIT19391
Ships in 6 Business Days
$ 66.99 USD
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Seals and blows out clogged lines/pipes
Mishimoto Stainless Steel T-Bolt Clamp - 3.0"
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Mishimoto - Corporate Logo
T#:31589358
Part#: MMCLAMP3
In Stock at Vendor
$ 7.99 USD
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High-pressure fuel pump supply port caps
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AGA Tools - Corporate Logo
T#:5135636
Part#: AGA-CP-0-14
Ships in 7 Business Days
$ 8.99 USD
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Don't let dirt be the reason for bad fuel injectors.
General Purpose Clamp - Priced Each
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Norma - Corporate Logo
T#:594670
Part#: 64218367179
In Stock at Vendor
$ 3.99

This product was last offered at the strikethrough price on
05-07-2026

$ 2.99 USD
Free Shipping on orders $49 and up
$ 2.99 USD
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Clamps are like bolts and nuts, as you can never have enough of them. If you do work on your vehicle in your home, you are going to need clamps often. If you need one clamp, why not get a few to ensure that you are always prepared.
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Hose Pinchers
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Lisle - Corporate Logo
T#:641682
Part#: LIS22850
Ships in 1 Business Day
$ 17.99 USD
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A must for any car enthusiast.

Wire Type Spark Plug Gapper .040 to .080
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Lisle - Corporate Logo
T#:641655
Part#: LIS67900
Ships in 1 Business Day
$ 4.99 USD
Free Shipping on orders $49 and up
Always check gap on your new spark plugs

Elring Intake Valve Seal Repair Kit - E30, E36
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Elring - Corporate Logo
T#:374871
Part#: 11349059171
In Stock at Vendor
$ 8.19 USD
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Includes seals to do half of your engine's valves
JE Piston - BMW S14B23 8.5:1 Piston Single 94.00mm
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JE Piston - Corporate Logo
T#:33713155
Part#: 321359S
In Stock at Vendor
$ 251.99 USD
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JE Pistons BMW S14B23 Piston - 8.5:1 Compression – 94.00 mm Bore – 1.260 in. CH, -23.70 CC is expertly engineered for BMW S14 engines, offering a lower compression ratio ideal for turbocharged and high-boost applications. Designed to provide increased power and durability, these high-performance pistons are perfect for enhancing the performance of the BMW E30 M3, delivering consistent results both on the street and track.

Available through Turner Motorsport, these JE Pistons are forged for maximum strength and heat resistance, making them capable of withstanding extreme pressure and high RPMs. With a 94.00 mm bore and -23.70 CC volume, these pistons are precisely crafted to optimize engine displacement and combustion efficiency, allowing for greater throttle response and boosted power output.

Key Benefits:

  • 8.5:1 compression ratio for optimal performance in turbocharged and high-boost applications
  • 94.00 mm bore for increased engine displacement and improved performance
  • 1.260 in. compression height and -23.70 CC volume for efficient combustion
  • Forged construction for maximum strength and durability under extreme conditions
  • Specifically designed for BMW S14B23 engines, including the iconic E30 M3
  • Available through Turner Motorsport, ensuring quality products and expert support
  • Ideal for motorsport and high-performance street applications
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AAF Oil Pan Baffle - E30 M5x
For Vehicles with M50/M52/S50/S52
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Advanced Auto Fabrication - Corporate Logo
T#:7593106
Part#: 116182
Ships in 3 Business Days
$ 155.00 USD
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$ 155.00 USD
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Since 2010, Advanced Auto Fabrication has been producing and developing both parts and full fledged race cars. Their knowledge base covers a wide range of vehicles both domestic and imported. In the specific case of BMW, the team at AAF has a particular affinity for building and designing components for BMW race cars. This oil pan baffle by AAF keeps the oil at the pick up better than others on the market. Baffling the oil pan is extremely important. Under racing and track conditions, oil can move in the oil pan enough to cause extended moments of oil starvation. This can cause premature, and in some cases immediate, engine failure. The pan features a tight fit to keep oil from exiting under braking or cornering. A must have for all track cars.
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Denso Spark Plug - Priced Each - E30 E34 E24, M3 M5 M6
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Denso - Corporate Logo
T#:641775
Part#: 4085
In Stock at Vendor
$ 3.26 USD
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Black Forest Industries Engine Mounts - Stage 1 - BMW E30 / E36 / E46...
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Black Forest Industries - Corporate Logo
T#:50934264
Part#: BFI-BMW-90-01
Ships on Aug 3, 2026
New Item
$ 199.99 USD
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Eliminate the "drive-line slop" common in the E36 and E46 chassis with this Stage 1 Engine Mount kit.

Oil Pan Gasket - Upper - E30 M3
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Packaged by Turner - Corporate Logo
T#:337964
Part#: 11131727974
In Stock at Vendor
Starting at $ 12.99 USD
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Starting at $ 12.99 USD
Free Shipping on orders $49 and up
E30 M3 Upper Oil-Pan Gasket. Have a leaky oil pan? It may be failed oil pan gaskets (either upper or lower). This is the UPPER oil pan gasket for the S14 and M10 engines. We offer this gasket in both cork and paper gasket media.
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Fuel Injector Clinic 775cc Fuel Injector - Set of 4
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Fuel Injector Clinic - Corporate Logo
T#:6940363
Part#: IS803-0775H
Ships in 1 Business Day
$ 410.00 USD
Free Shipping
$ 410.00 USD
Free Shipping
High performance fuel injectors featuring high impedance Bosch core, E85 compatible, with a lifetime warranty. This injector set is precisely matched using Fuel Injector Clinic's proprietary Data Match Technology. Each injector is individually serial numbered and the results are provided on the Data Match Sheet providing the most complete flow matching and latency value information available in the industry today. Fuel Injector Clinic injectors are flow tested and rated at 43.5psi (3Bar) at 90deg F fuel temperature using CF-16B calibration fluid. A superior short pulse width control and state of the art matching make these injectors easy to tune and provide great drivability. Every injector is covered against failure caused by defects in original manufacture by a lifetime warranty.
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JE Piston - BMW S14B23 13:1 Piston Single - 93.80mm
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JE Piston - Corporate Logo
T#:33713142
Part#: 312385S
In Stock at Vendor
$ 251.99 USD
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JE Pistons BMW S14B23 Piston - 13:1 Compression – 93.80 mm Bore – 1.260 in. CH, 3.60 CC is engineered for high-performance BMW engines, delivering unmatched power and reliability for motorsport enthusiasts. These precision pistons are designed for the iconic BMW S14 engine, commonly found in the legendary E30 M3, enhancing performance with advanced materials and optimized compression ratios.

Turner Motorsport offers these forged pistons for racers looking to maximize their engine's potential. The 13:1 compression ratio provides excellent throttle response, increased horsepower, and torque. Built for durability, JE Pistons ensure that your BMW engine runs efficiently under high-stress conditions on both the track and the street.

Key Benefits:

  • Optimized 13:1 compression ratio for superior engine performance
  • High-strength forged construction for long-lasting durability
  • Designed for BMW S14B23 engines, including E30 M3
  • Enhanced bore and compression height for precision fitment
  • Increased horsepower and torque for motorsport applications
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JE Piston - BMW S14B23 13:1 Piston Single 94.00mm
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
JE Piston - Corporate Logo
T#:33713146
Part#: 312386S
In Stock at Vendor
$ 251.99 USD
Free Shipping on orders $49 and up

JE Pistons BMW S14B23 Piston - 13:1 Compression – 94.00 mm Bore – 1.260 in. CH, 3.40 CC is designed to elevate the performance of BMW S14 engines, delivering maximum power, reliability, and precision. These high-performance pistons are engineered specifically for motorsport enthusiasts and are a perfect fit for the iconic BMW E30 M3, providing a significant boost in horsepower and torque.

Available through Turner Motorsport, these JE Pistons feature a 13:1 compression ratio and a 94.00 mm bore, optimizing combustion efficiency for enhanced throttle response. Built from forged materials, they are designed to withstand extreme conditions, ensuring durability and long-lasting performance under high stress on the street or track.

Key Benefits:

  • 13:1 compression ratio for superior engine performance and power
  • 94.00 mm bore for optimized engine displacement and precision fitment
  • 1.260 in. compression height and 3.40 CC volume for enhanced combustion
  • Forged construction for maximum strength and durability
  • Specifically engineered for BMW S14B23 engines, including the E30 M3
  • Available through Turner Motorsport, providing trusted quality and expert support
  • Ideal for both street performance and motorsport applications
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BFI Transmission Mounts - Stage 1 - BMW E30 / E36 / E46 / E9X / Z3 / ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Black Forest Industries - Corporate Logo
T#:50934269
Part#: BFI-BMW-TRANS-01
Ships on Aug 3, 2026
New Item
$ 69.99 USD
Free Shipping on orders $49 and up
This kit is a "must-have" for any E36, E46, or E9X owner looking to tighten up their drivetrain's foundation and ensure long-term mechanical reliability.