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BMW Engine Parts

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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ECS - Corporate Logo
T#:49996974
Part#: 059235LA01
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This product was last offered at the strikethrough price on
06-14-2026

$ 23.99 USD
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This product was last offered at the strikethrough price on
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If you're experiencing hard starting, flaky charging, or other electrical issues, your engine ground strap may be the culprit. On older BMWs, the engine ground strap is a thin, non-insulated cable that spans from the engine mount arm to the frame horn. Despite the seemingly simple nature of this part, on older cars, it is known to cause massive headaches. Due to its non-insulated design, years of exposure to water, dirt, and road salt will cause the wire to corrode, ultimately leading to complete failure. A break in this cable will cause an open circuit, resulting in issues with the vehicle's electrical system and potentially leading to a no-start condition.

To solve this issue, ECS has engineered an exact-fit, upgraded ground strap for your BMW! Unlike its OEM counterpart, this design features insulated, large-gauge copper wire for dependable conductivity and long-lasting durability. Additionally, factory-style lugs are zinc-coated, crimped, and soldered, ensuring protection against corrosion and oxidation.

Whether you're replacing a visibly corroded strap or proactively preventing failure, this solution from ECS is sure to provide lasting performance and protection.

FEATURES

Direct-fit replacement and upgrade for E30 (318i/is), E36, E39, E46, and others Solves intermittent grounding issues caused by aging OEM straps Clean, stealthy design that fits seamlessly in factory engine bays Factory length and lug orientation for drop-in fitment 2 AWG tinned copper cable for excellent conductivity and corrosion resistance Zinc-coated lugs, crimped and soldered to resist moisture and oxidation Black UL1015-grade insulation withstands oil, heat, and abrasion Discreet ECS label for a clean, OEM+ look Replaces OEM part numbers 12421737755 and 12421714262.

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Victor Reinz - Corporate Logo
T#:1551
Part#: 11121721938
In Stock
Sale - Save 66% $ 62.21

This product was last offered at the strikethrough price on
05-14-2026

$ 20.94 USD
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Sale - Save 66%
$ 62.21

This product was last offered at the strikethrough price on
05-14-2026

$ 20.94 USD
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Head Bolt Set for all M50 engines with a steel engine block.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.​

This item fits the following BMWs:
992-1998 E36 BMW 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1991-1995 E34 BMW 525i
1997-1998 E39 BMW 528i
1998-2000 Z3 BMW M Roadster M Roadster
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ECS - Corporate Logo
T#:49996976
Part#: 059261LA01
In Stock
New Item
Sale - Save 25% $ 29.99

This product was last offered at the strikethrough price on
06-14-2026

$ 22.49 USD
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$ 29.99

This product was last offered at the strikethrough price on
06-14-2026

$ 22.49 USD
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If you're experiencing hard starting, flaky charging, or other electrical issues, your engine ground strap may be the culprit. On E70/E71 BMWs, the engine ground strap is a thin, non-insulated cable that spans from the left engine mount arm to the frame horn. Despite the seemingly simple nature of this part, on older cars, it is known to cause massive headaches. Due to its non-insulated design, years of exposure to water, dirt, and road salt will cause the wire to corrode, ultimately leading to complete failure. A break in this cable will cause an open circuit, resulting in issues with the vehicle's electrical system and potentially leading to a no-start condition.

To solve this issue, ECS has engineered an exact-fit, upgraded ground strap for your BMW X5/X6! Unlike its OEM counterpart, this design features insulated, large-gauge copper wire for dependable conductivity and long-lasting durability. Additionally, factory-style lugs are zinc-coated, crimped, and soldered, ensuring protection against corrosion and oxidation.

Whether you're replacing a visibly corroded strap or proactively preventing failure, this solution from ECS is sure to provide lasting performance and protection.

FEATURES

Direct-fit replacement and upgrade for E70 X5 and E71 X6 applications Solves intermittent grounding issues caused by aging OEM straps Clean, stealthy design that fits seamlessly in factory engine bays Factory length and lug orientation for drop-in fitment 2 AWG tinned copper cable for excellent conductivity and corrosion resistance Zinc-coated lugs, crimped and soldered to resist moisture and oxidation Black UL1015-grade insulation withstands oil, heat, and abrasion Discreet ECS label for a clean, OEM+ look Replaces OEM part number 12427557027.

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Rein - Corporate Logo
T#:53785545
Part#: TRK0025
In Stock at Vendor
New Item
$ 475.99 USD
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$ 475.99 USD
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Rein TechSelect Turbo Kits feature replacements to the OE Turbocharger, including brackets, hardware and gaskets.

Genuine BMW - Corporate Logo
T#:50898995
Part#: 11428469100
Ships in 1-2 days
New Item
4% off MSRP $ 22.99

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

$ 21.99 USD
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4% off MSRP
$ 22.99

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

$ 21.99 USD
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Gemini said Seal your S58 oiling system with this filter gasket and hardware!
Bremmen Parts - Corporate Logo
T#:49787653
Part#: 000550
In Stock
New Item
Sale - Save 7% $ 26.99

This product was last offered at the strikethrough price on
05-03-2026

$ 25.18 USD
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Sale - Save 7%
$ 26.99

This product was last offered at the strikethrough price on
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$ 25.18 USD
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Rein - Corporate Logo
T#:53856273
Part#: 11652247620
Back Ordered
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$ 26.99 USD
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The Rein Automotive OE Series vacuum reservoir is engineered to maintain peak pneumatic response within your vehicle’s forced induction system.
Rein - Corporate Logo
T#:55965837
Part#: 11138590017
Ships in 3 Business Days
New Item
$ 199.99 USD
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Don't let a damaged oil pan sideline your ultimate driving machine. Restore your vehicle's engine protection and structural oil containment with this premium quality oil pan from Rein. This engine oil pan provides a replacement solution for modern BMW and MINI powerplants that have suffered from road hazards or harsh impacts.
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Genuine BMW - Corporate Logo
T#:53608864
Part#: 13515B940B9
In Stock
New Item
3% off MSRP $ 31.00

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

$ 29.99 USD
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3% off MSRP
$ 31.00

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

$ 29.99 USD
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Genuine BMW - Corporate Logo
T#:56471616
Part#: 11655B4A549
Ships in 6 Business Days
New Item
6% off MSRP $ 183.99

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

$ 172.99 USD
6% off MSRP
$ 183.99

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

$ 172.99 USD
Eldor - Corporate Logo
T#:54852008
Part#: 12139453463
In Stock
New Item
$ 77.99 USD
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$ 77.99 USD
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Sluggish acceleration, misfires, rough idling, poor fuel economy, and check engine lights are symptoms of a worn coil. Located on the top of your engine, these coils should be inspected and replaced as needed or every 60,000 miles to keep your ignition system in perfect order
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Bremmen Parts - Corporate Logo
T#:56110314
Part#: 11127560482
In Stock
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$ 9.99 USD
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Bremmen Parts - Corporate Logo
T#:26305066
Part#: 11311739130
In Stock
Sale - Save 69% $ 19.99

This product was last offered at the strikethrough price on
05-03-2026

$ 6.25 USD
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Sale - Save 69%
$ 19.99

This product was last offered at the strikethrough price on
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$ 6.25 USD
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Bremmen Parts - Corporate Logo
T#:51320854
Part#: 22116778610
Ships on Sep 28, 2026
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05-03-2026

$ 64.59 USD
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$ 64.59 USD
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Bremmen Parts - Corporate Logo
T#:52551471
Part#: 12617607910KT1
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This product was last offered at the strikethrough price on
05-03-2026

$ 135.99 USD
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$ 159.99

This product was last offered at the strikethrough price on
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$ 135.99 USD
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Reads oil level in oil pan, includes new hardware and seal

Genuine BMW - Corporate Logo
T#:32464
Part#: 11211717782
In Stock
Sale - Save 72% $ 32.99

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

$ 9.34 USD
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$ 32.99

This product was last offered at the strikethrough price on
05-02-2026

$ 9.34 USD
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Genuine BMW Bearing Shell Yellow - 59,50Mm(+0,50)
This item fits the following BMW Chassis:
E36 M3,E30,E34,E36,E39,E46,E53 X5 X5,E83 X3,E85 Z4

Fits BMW Engines including:
M20,M42,M44,M50,M52,M54,M56,S50,S52

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Bremmen Parts - Corporate Logo
T#:26271805
Part#: 11417519870
In Stock
Sale - Save 60% $ 26.99

This product was last offered at the strikethrough price on
05-03-2026

$ 10.79 USD
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Sale - Save 60%
$ 26.99

This product was last offered at the strikethrough price on
05-03-2026

$ 10.79 USD
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Bremmen Parts - Corporate Logo
T#:26271801
Part#: 11411716988
In Stock
Sale - Save 91% $ 18.99

This product was last offered at the strikethrough price on
05-03-2026

$ 1.62 USD
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Sale - Save 91%
$ 18.99

This product was last offered at the strikethrough price on
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$ 1.62 USD
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Bremmen Parts - Corporate Logo
T#:56110317
Part#: 11127588412MKT
In Stock
New Item
$ 346.80 USD
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Bremmen Parts - Corporate Logo
T#:56110315
Part#: 11127570292MKT
In Stock
New Item
$ 283.99 USD
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With Cap!

Bremmen Parts - Corporate Logo
T#:50381429
Part#: 13527800025
In Stock
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Sale - Save 21% $ 75.99

This product was last offered at the strikethrough price on
05-03-2026

$ 60.38 USD
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$ 60.38 USD
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The N57 High-Pressure Fuel Pump Sprocket is a crucial component in BMW vehicles equipped with the N57 diesel engine. It drives the high-pressure fuel pump, ensuring precise fuel delivery for efficient combustion and optimal engine performance. This sprocket is also important in linking the timing chain system from the crankshaft to the fuel pump and then to the camshafts.
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ECS - Corporate Logo
T#:5858452
Part#: 3PK968
In Stock
Sale - Save 78% $ 27.99

This product was last offered at the strikethrough price on
05-03-2026

$ 6.02 USD
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Sale - Save 78%
$ 27.99

This product was last offered at the strikethrough price on
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$ 6.02 USD
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Replaces BMW # 11288638616 & 11285A04DA2 ECS Tuning Performance Kevlar-reinforced belts give you that extra peace of mind! Kevlar reinforced belts experience less elongation over time minimizing the amount of belt adjustment needed as well as offering a higher shock and impact resistance compared to OEM style belts. ECS Tuning Performance Kevlar-reinforced belts have been put through a series of multiple tests: Tensile strength Elongation Hardness Temperature and oil resistance per standard JASO E 109-94 Flex testing per SAE J2432.
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Genuine BMW - Corporate Logo
T#:407720
Part#: 11611730742
In Stock
Sale - Save 74% $ 18.99

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

$ 5.00 USD
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Sale - Save 74%
$ 18.99

This product was last offered at the strikethrough price on
05-02-2026

$ 5.00 USD
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ECS - Corporate Logo
T#:3729869
Part#: 11127646555P
In Stock
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This product was last offered at the strikethrough price on
05-15-2026

$ 0.99 USD
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$ 1.99

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$ 0.99 USD
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Genuine BMW - Corporate Logo
T#:139452
Part#: 61129241328
In Stock
Sale - Save 64% $ 316.99

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

$ 114.00 USD
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$ 316.99

This product was last offered at the strikethrough price on
05-02-2026

$ 114.00 USD
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Genuine BMW Wiring Harness, Actuator Control Module -
This item fits the following BMW Chassis:
F10,F12,F13

ECS - Corporate Logo
T#:372427
Part#: 91290A231
In Stock
Sale - Save 80% $ 4.99

This product was last offered at the strikethrough price on
05-02-2026

$ 0.99 USD
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Sale - Save 80%
$ 4.99

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$ 0.99 USD
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Allen Head Bolt

Upgrade your fastening needs with the Allen Head Bolt, a versatile and reliable solution for various applications. Crafted from high-quality materials, these bolts offer exceptional strength and durability. Their allen head design ensures secure tightening and easy access, making them ideal for automotive, construction, and DIY projects. Elevate your projects with the precision and reliability of Allen Head Bolts.

  • High-quality materials for exceptional strength
  • Secure tightening with allen head design
  • Versatile usage for automotive, construction, and DIY projects
  • Reliable and durable solution for various applications
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Bremmen Parts - Corporate Logo
T#:26404781
Part#: 13522249623
In Stock
Sale - Save 80% $ 25.99

This product was last offered at the strikethrough price on
05-03-2026

$ 5.18 USD
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Sale - Save 80%
$ 25.99

This product was last offered at the strikethrough price on
05-03-2026

$ 5.18 USD
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BMW E70/E90 M57 3.0L Lower Timing Chain Tensioner

Looking for a reliable lower timing chain tensioner replacement for your BMW E70 or E90 with the M57 3.0L engine? The BMW E70/E90 M57 3.0L Lower Timing Chain Tensioner is the perfect choice. This tensioner ensures proper timing chain tension, preventing engine damage and optimizing performance. Crafted with high-quality materials and precision engineering, it offers the following benefits:

  • Ensures proper timing chain tension for optimal engine performance
  • Prevents engine damage caused by improper tension
  • Crafted with high-quality materials for durability
  • Compatible with BMW E70 and E90 models for easy installation
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Bremmen Parts - Corporate Logo
T#:26305077
Part#: 13528506969
In Stock
Sale - Save 69% $ 34.99

This product was last offered at the strikethrough price on
05-03-2026

$ 10.78 USD
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Sale - Save 69%
$ 34.99

This product was last offered at the strikethrough price on
05-03-2026

$ 10.78 USD
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BMW E70/E90 M57 3.0L Lower Timing Chain

In search of a dependable replacement for the lower timing chain in your BMW E70 or E90 with the M57 3.0L engine? Turner Motorsport offers the BMW E70/E90 M57 3.0L Lower Timing Chain for your needs. This timing chain ensures precise engine timing, guarding against potential damage and enhancing performance. Crafted with premium materials and precision engineering, it boasts the following benefits:

  • Ensures precise engine timing for enhanced performance
  • Guards against potential damage caused by improper timing
  • Crafted with premium materials for durability
  • Compatible with BMW E70 and E90 models for straightforward installation
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Bremmen Parts - Corporate Logo
T#:22558959
Part#: 94235A080
In Stock
Sale - Save 62% $ 3.99

This product was last offered at the strikethrough price on
05-03-2026

$ 1.53 USD
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Sale - Save 62%
$ 3.99

This product was last offered at the strikethrough price on
05-03-2026

$ 1.53 USD
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Genuine BMW - Corporate Logo
T#:55209893
Part#: 071199631KT
In Stock
New Item
$ 2.80 USD
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The Genuine BMW Performance Sealing Washer Kit features the foundational hardware required to complete your top-end or track-day prep correctly.

Genuine BMW - Corporate Logo
T#:55317666
Part#: 51757LOEBPKT
In Stock
New Item
$ 54.04 USD
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Keep your chassis protected from track day debris and daily road grime with the Genuine BMW Outer Left Engine Bay Partition Kit.
Genuine BMW - Corporate Logo
T#:55317660
Part#: 1143DTSKT
In Stock
New Item
$ 16.08 USD
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Keep your BMW's engine bay dry and your crankcase pressure sealed properly with this Genuine BMW lower dipstick tube sealing kit.


Genuine BMW - Corporate Logo
T#:55317699
Part#: 116117IMKT
In Stock
New Item
$ 51.74 USD
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Turner Motorsport offers this direct-fit Intake Manifold and Air Temp Sensor Seal Kit to eliminate modern vacuum leaks before they spoil your driving experience.
Genuine BMW - Corporate Logo
T#:55245835
Part#: 11421703XKT
In Stock
New Item
$ 11.20 USD
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This Genuine BMW Oil Cooler O-Ring Kit brings together the exact factory-spec seals needed to overhaul your lines and oil thermostat assembly.
Genuine BMW - Corporate Logo
T#:55317667
Part#: 1161TBIPGKT
In Stock
New Item
$ 28.70 USD
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This Throttle Body and Intake Profile Gasket Kit features a factory Genuine BMW profile gasket paired with a robust Victor Reinz throttle body housing gasket.


Genuine BMW - Corporate Logo
T#:55317701
Part#: 1161N47TBKT
In Stock
New Item
$ 56.01 USD
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This Turner Motorsports Gasket Kit combines the throttle body profile gasket and the valve cover gasket set into a single, track-tested maintenance bundle.
Bremmen Parts - Corporate Logo
T#:56110324
Part#: 22116856403
Ships in 2 Business Days
New Item
$ 115.50 USD
$ 115.50 USD
Rein - Corporate Logo
T#:52516259
Part#: AVE0760
Ships in 3 Business Days
New Item
$ 63.99 USD
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The Rein Automotive AVE0760 Engine Mount is a precision-engineered replacement designed specifically for BMW's xDrive platforms.

Rein - Corporate Logo
T#:53750207
Part#: PKP0124
Back Ordered
New Item
$ 41.99 USD
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$ 41.99 USD
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Upgrade the Plastic Pulley in Your BMW with an All Aluminum Construction Replacement from Rein

Rein - Corporate Logo
T#:53750214
Part#: HWU0115
Ships in 3 Business Days
New Item
$ 17.99 USD
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Rein Oil Drain Plug with Aluminum Construction, OE Dimensions and Threading. Upgrade Over Stock with a Magnetic tip to collect unwanted debris
Rein - Corporate Logo
T#:53573470
Part#: 13537605189
In Stock
New Item
$ 102.99 USD
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$ 102.99 USD
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Rein - Corporate Logo
T#:53750169
Part#: PKP0121
Ships in 3 Business Days
New Item
$ 63.99 USD
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Upgrade the Plastic Pulley in Your BMW with an All Aluminum Construction Replacement from Rein
Rein - Corporate Logo
T#:53750204
Part#: PKP0123
Ships in 3 Business Days
New Item
$ 61.99 USD
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$ 61.99 USD
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Upgrade the Plastic Pulley in Your BMW with an All Aluminum Construction Replacement from Rein

Rein - Corporate Logo
T#:53856281
Part#: 11427643176
In Stock at Vendor
New Item
$ 70.99 USD
$ 70.99 USD
The Rein Turbo Oil Feed Pipe is engineered to meet the rigorous tolerances required by high-performance forced induction systems.

Supercharger Kit Level 1 - E46 328 '99-'02
For model years 1999-2002 ~ Call in to provide vin before purchase
Active Autowerke - Corporate Logo
T#:50899197
Part#: 12-016M438
Ships in 10 Business Days
New Item
$ 9,856.00 USD
Free Shipping
$ 9,856.00 USD
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Add proven forced induction performance to your E46 with the Active Autowerke 328i Supercharger Kit. Engineered to work seamlessly with your factory ECU and 91 to 93 octane pump fuel, this system uses dyno developed software to precisely manage ignition timing, fueling, VANOS, and rev limits through the stock DME. The result is smooth, repeatable power delivery with OEM-like drivability and the ability to return the vehicle to stock if desired. A self contained oil cooling system keeps installation clean without interfering with the factory oil circuit. For E46 owners looking to approach M3 level performance without the full swap, this complete bolt-on solution delivers substantial gains with proven reliability. Key Features Rotrex C38-81 trim supercharger 8 PSI boost pressure CNC machined supercharger bracket with hardware Self contained oil system with front mount cooler Six higher flow fuel injectors Active Autowerke/Bosch bypass valve High temperature silicone hoses with stainless clamps Mandrel bent aluminum charge tubing Active Autowerke performance air filter (K&N on select models) Active Autowerke dyno tuned software Complete hardware and illustrated instructions 1 year warranty with tech support Performance Power: 320 BHP @ 7000 RPM Torque: 260 lb ft @ 5400 RPM Boost: 8.0 PSI
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Supercharger Kit Level 1 - E46 3330i
For model years 1999-2002 ~ Call in to provide vin before purchase
Active Autowerke - Corporate Logo
T#:50899198
Part#: 12-016M430
Ships in 10 Business Days
New Item
$ 9,856.00 USD
Free Shipping
$ 9,856.00 USD
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Add proven forced induction performance to your E46 330i with the Active Autowerke Supercharger Kit. Designed to deliver a significant horsepower increase without sacrificing daily usability, this system operates safely on 91 to 93 octane pump fuel and integrates directly with the factory ECU. Active Autowerke’s dyno developed calibration manages ignition timing, fueling, VANOS function, and rev limits through the stock DME for consistent, predictable results. Power delivery remains smooth and repeatable with OEM like drivability, and the system can be returned to stock configuration if needed. The included self contained oil cooling circuit keeps installation straightforward without modifying the factory oil system. For E46 owners seeking a complete, well engineered bolt on solution, this kit offers substantial, reliable gains. Key Features Rotrex C38-81 trim supercharger 8 PSI boost pressure CNC machined supercharger bracket with hardware Self contained oil system with front mount oil cooler Six higher flow fuel injectors Active Autowerke/Bosch bypass valve High temperature silicone hoses with stainless clamps Mandrel bent aluminum tubing for improved flow Active Autowerke performance air filter (K&N on select models) Active Autowerke dyno tuned software Complete mounting hardware, plumbing, hoses, and clamps Illustrated installation manual and guide 1 year warranty with technical support Performance Specifications Power: 320 BHP @ 7000 RPM Torque: 260 lb ft @ 5400 RPM Boost Level: 8.0 PSI
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Bapmic - Corporate Logo
T#:54388517
Part#: 61129259425
Ships in 2 Business Days
New Item
$ 126.99 USD
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On the track or on the street, your BMW’s electrical architecture demands absolute consistency. A degraded positive battery cable introduces unwanted resistance, leading to weak starts, alternator strain, and erratic module behavior. When it’s time to replace a compromised factory cable, you don’t need over-hyped marketing—you need a part that fits precisely and restores factory grid integrity.
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Supercharger Kit Level 1 - E46 330 2003+
For model years 2003+ ~ Call in to provide vin before purchase
Active Autowerke - Corporate Logo
T#:50899201
Part#: 12-016M45
Ships in 10 Business Days
New Item
$ 9,856.00 USD
Free Shipping
$ 9,856.00 USD
Free Shipping
Add proven forced induction performance to your E46 330i with the Active Autowerke Supercharger Kit. Designed to deliver a significant horsepower increase without sacrificing daily usability, this system operates safely on 91 to 93 octane pump fuel and integrates directly with the factory ECU. Active Autowerke’s dyno developed calibration manages ignition timing, fueling, VANOS function, and rev limits through the stock DME for consistent, predictable results. Power delivery remains smooth and repeatable with OEM like drivability, and the system can be returned to stock configuration if needed. The included self contained oil cooling circuit keeps installation straightforward without modifying the factory oil system. For E46 owners seeking a complete, well engineered bolt on solution, this kit offers substantial, reliable gains. Key Features Rotrex C38-81 trim supercharger 8 PSI boost pressure CNC machined supercharger bracket with hardware Self contained oil system with front mount oil cooler Six higher flow fuel injectors Active Autowerke/Bosch bypass valve High temperature silicone hoses with stainless clamps Mandrel bent aluminum tubing for improved flow Active Autowerke performance air filter (K&N on select models) Active Autowerke dyno tuned software Complete mounting hardware, plumbing, hoses, and clamps Illustrated installation manual and guide 1 year warranty with technical support Performance Specifications Power: 320 BHP @ 7000 RPM Torque: 260 lb ft @ 5400 RPM Boost Level: 8.0 PSI
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Genuine BMW - Corporate Logo
T#:55209942
Part#: 1153175KT
Ships in 3 Business Days
New Item
$ 14.29 USD
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This Genuine BMW Coolant Pipe and Thermostat Sealing Kit features the exact factory-issued rubber O-rings needed to seal the smaller engine block water line and the main thermostat unit housing.