BMW Internal Engine Parts for BMW 3 Series E46 (1999-2005)

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Rebuilding your engine or giving your cylinder head an overhaul? Internal engine components covers parts that are located within the engine block and cylinder head. Examples include: timing chains and tensioners, rocker arms, rod bolts and studs, head bolts, valve springs, connecting rods, and more. These are Genuine BMW engine parts, performance upgrades, or approved aftermarket brands that have a long track record of reliability and quality.

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ARP Connecting Rod Bolt Set - S54 (M10, 02/2003- Production)
ARP Connecting Rod Bolt Set - S54 (M10, 02/2003- Production) ...
For vehicles with production from 02/2003
ARP - Corporate Logo
T#:2206
Part#: 201-6102
In Stock
$ 119.99

This product was last offered at the strikethrough price on
10-01-2026

$ 116.99 USD
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Set of 12 ProSeries ARP2000 connecting rod bolts for the Euro-spec M3 engine. Made by ARP, the world leader in fastener technology. The best rod bolts available for the Euro S50 and S54. Ideal for ultra high performance, racing & forced induction applications. Each bolt is made of ARP2000 material, which exceeds the strength of 8740 Chrome Moly, and is able to achieve clamp load at 220,000psi. ARP2000 fasteners are used widely in professional motorsport and drag racing as an upgrade from 8740 Chrome Moly in both steel and aluminum rods.

This set replaces the factory BMW Euro S50B30 and B32 rod bolts with part number 11-24-1-317-184 (11241317184) and 11-24-1-405-890 (11241405890). It's also used for S54 engines with stock M10 sized rod bolts, which were used from February 2003 production and later. It was also used in earlier engines that had connecting rods replaced. For these 2001-2003 models there is no easy way to check if the rods were replaced, except by checking the rod bolt diameter. If your car has the earlier M11 sized bolt, use ARP kit #201-6103 . Before opening the ARP kit, we recommend that you check your existing rod bolt size as BMW was not consistent with their applications. ARP bolts are not returnable if the package has been open.

ARP is a company that prides itself on performance and durability, no matter the application. Offering the finest engine hardware money can buy is the driving initiative at ARP and this is evidenced by the staggering amount of satisfied customers and race teams the world over.

These ARP connecting rod bolts fit the following BMWs:
1993-1999 E36 BMW Euro M3
2001-2/2003 E46 M3 coupe / convertible*
2/2003-2006 E46 M3 coupe / convertible
2001-2002 MZ3 M Roadster & M Coupe*
2006-2008 MZ4 M Roadster & M Coupe
* - these engines could have either M10 or M11 sized bolts. If the rods and rod bearings were replaced under recall by BMW it should have the newer M10 bolts and this is the correct ARP set to order.
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ARP Connecting Rod Bolt Kit - M52, M54B30, N20, N26, N54, N55, B46, B48, B58, S55
ARP Connecting Rod Bolt Kit - M52, M54B30, N20, N26, N54, N55, B46, B...
ARP - Corporate Logo
T#:3315
Part#: 201-6303
In Stock
$ 212.99

This product was last offered at the strikethrough price on
10-12-2026

$ 194.99 USD
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$ 194.99 USD
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Set of 12 ProSeries connecting rod bolts, made by ARP -- the world leader in fastener technology. Each bolt is made of ARP2000 material, which exceeds the strength of 8740 Chrome Moly, and is able to achieve clamp load at 220,000psi. ARP2000 fasteners are used widely in motorsport and drag racing as an upgrade from 8740 Chrome Moly in both steel and aluminum rods. These are simply the best connecting rod bolts available, making them ideal for ultra high performance, racing and forced induction applications.

This set replaces the 47mm length factory BMW rod bolts with part number 11-24-7-589-671 (11247589671) Check applications before ordering! Opened ARP bolt kits are not
returnable.

ARP is a company that prides itself on performance and durability, no matter the application. Offering the finest engine hardware money can buy is the driving initiative at ARP and this is evidenced by the staggering amount of satisfied customers and race teams the world over.

This item fits the following BMWs:
1999-2005 E46 BMW 328i 328ci 330i 330ci 330xi
2001-2003 E39 BMW 530i
2004-2005 E60 BMW 530i
2004-2006 E83 BMW X3 3.0i
2000-2006 E53 BMW X5 3.0i
1997-2002 Z3 BMW Z3 3.0i
2003-2005 Z4 BMW Z4 3.0i
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ARP Steel Block Head Stud Kit for M50/M52 & S50/S52 (US Spec)
ARP Steel Block Head Stud Kit for M50/M52 & S50/S52 (US Spec) ...
ARP - Corporate Logo
T#:3606
Part#: 201-4302
In Stock
$ 240.99 USD
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Virtually every top professional BMW engine builder relies on ARP Pro Series head studs. ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Each stud is heat-treated to 200,000 psi, ensuring complete heat penetration. ARP studs are threaded after heat-treat, which gives them 1000% (that's ten times!) better fatigue strength than studs threaded prior to heat-treat. Threading the studs after heat-treating is more difficult and costly (as it's harder on tooling) but the results are well worth the effort. These simply are the best head studs we've found for the E36 6 cylinder engines, and we highly recommend them in both the racing and forced induction arena. (Due to the additional clamping force between the head and block, these are IDEAL for turbo charging and supercharging!)

Converting from the factory BMW head bolts to head studs makes it much easier to assemble an engine, especially a racing powerplant which must be serviced frequently (and quickly!), and also ensures proper alignment of the head and gasket. Head studs also provide more accurate and consistent torque loading. Here's why: When you use bolts to secure the head, the fastener is actually being "twisted" while it's being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously. A head stud should be installed in a "relaxed" mode -- never crank it in tightly using a jammed nut. If everything is right, the stud should be installed finger tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. An information sheet is provided with each set. Kit includes everything pictured -- 14 head bolts, washers, bolts and assembly lubricant.

ARP is a company that prides itself on performance and durability, no matter the application. Offering the finest engine hardware money can buy is the driving initiative at ARP and this is evidenced by the staggering amount of satisfied customers and race teams the world over.

These head studs fit the following BMWs/engines (steel block only)
1992-1995 M50 6 cylinder including 325i, 325is and 525i
1996-1999 M52 6 cylinder including 328i, 328is, 323is, 528i
1995-1995 S50US 3.0 liter including 1995 M3 (US only)
1996-1999 S52US 3.2 liter including 1996-1999 M3 (US) and MZ3
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ARP Connecting Rod Bolt Kit - Early S54 - E46 M3, MZ3 (M11x47mm Size)
ARP Connecting Rod Bolt Kit - Early S54 - E46 M3, MZ3 (M11x47mm Size)...
For vehicles with production up to 02/2003
ARP - Corporate Logo
T#:2211
Part#: 201-6103
In Stock
$ 215.99 USD
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$ 215.99 USD
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Set of 12 ProSeries connecting rod bolts, made by ARP -- the world leader in fastener technology. Each bolt is made of ARP2000 material, which exceeds the strength of 8740 Chrome Moly, and is able to achieve clamp load at 220,000psi. ARP2000 fasteners are used widely in motorsport and drag racing as an upgrade from 8740 Chrome Moly in both steel and aluminum rods. These are simply the best connecting rod bolts available, making them ideal for ultra high performance, racing and forced induction applications.

These bolts are M11 size to replace the stock M11 BMW bolt part number 11-24-7-834-310 (11247834310). The M11 bolt size was used in S54 engines up to 2/2003 production. However, most S54 engines up to that point had their rod bearings replaced under a factory recall and some may have had new connecting rods installed at the same time (or even a new engine altogether). The new bolts installed in these earlier engines are M10 size. Unfortunately, there is no way of knowing which rod or bolt is currently in your car (unless your car came with service records detailing when and what was replaced). The only sure way to know is to check the bolts currently installed in your engine. If yours was updated to the M10 sized bolt, use ARP kit #201-6102 . ARP bolts are not returnable if the pacakge has been open.

ARP is a company that prides itself on performance and durability, no matter the application. Offering the finest engine hardware money can buy is the driving initiative at ARP and this is evidenced by the staggering amount of satisfied customers and race teams the world over.

These ARP connecting rod bolts fit the following BMWs:
2001-2/2003 E46 M3 coupe / convertible
2001-2002 MZ3 M Roadster & M Coupe
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ARP S54 Head Stud Kit (E46M3 / MZ3 / MZ4)
ARP S54 Head Stud Kit (E46M3 / MZ3 / MZ4)
ARP - Corporate Logo
T#:3631
Part#: 201-4303
In Stock at Vendor
$ 247.99 USD
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$ 247.99 USD
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Virtually every top professional BMW engine builder relies on ARP Pro Series head studs, particularly on the S54 3.2 liter engine. ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Each stud is heat-treated to 200,000 psi, ensuring complete heat penetration. ARP studs are threaded after heat-treat, which gives them 1000% (that's ten times!) better fatigue strength than studs threaded prior to heat-treat. Threading the studs after heat-treating is more difficult and costly (as it's harder on tooling) but the results are well worth the effort. These simply are the best S54 head studs we've found for the E46 M3 6 cylinder engines, and we highly recommend them in both the racing and forced induction arena. (Due to the additional clamping force between the head and block, these are IDEAL for turbo charging and supercharging!)

Converting from the factory BMW head bolts to head studs makes it much easier to assemble an engine, especially a racing powerplant which must be serviced frequently (and quickly!), and also ensures proper alignment of the head and gasket. Head studs also provide more accurate and consistent torque loading. Here's why: When you use bolts to secure the head, the fastener is actually being "twisted" while it's being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously. A head stud should be installed in a "relaxed" mode -- never crank it in tightly using a jammed nut. If everything is right, the stud should be installed finger tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. An information sheet is provided with each set. Kit includes everything pictured -- 14 head bolts, washers, bolts and assembly lubricant.

ARP is a company that prides itself on performance and durability, no matter the application. Offering the finest engine hardware money can buy is the driving initiative at ARP and this is evidenced by the staggering amount of satisfied customers and race teams the world over.​

These head studs fit the following BMWs/engines
2001-2006 E46 M3 coupe & convertible
2001-2002 MZ3 M Roadster & M Coupe (with S54 engine)
2006-2008 MZ4 Z4 M Roadster & M Coupe
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S5X/M5X/M44/M20/M10- WPC Treated Rod Bearing Set - (Standard/Red Shell)
S5X/M5X/M44/M20/M10- WPC Treated Rod Bearing Set - (Standard/Red Shel...
10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!
ECS - Corporate Logo
T#:395066
Part#: 11241284849WPC
In Stock
Sale - Save 25% $ 188.99

This product was last offered at the strikethrough price on
11-07-2026

$ 141.74 USD
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Sale - Save 25%
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These WPC-treated bearings are the best we have seen! WPC is a shot-peening treatment at a microscopic level. It's perfect for sensitive surfaces like bearings. The WPC treatment removes imperfections and high spots, while creating a surface that retains oil better than the original surface. This greatly reduces friction. The bearings in this kit are original equipment KS bearings that are sent to WPC for treatment. The treated bearings are stronger with less metal fatigue and less friction than buying off-the-shelf bearings from the dealer.

This item fits the following BMWs: 
1984-1991 E30 BMW 318i 318is 318ic 325e 325es 325i 325ic 325is 325ix 
1992-1998 E36 BMW 318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3 
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
1982-1988 E28 BMW 528e
1989-1995 E34 BMW 525i
1997-2003 E39 BMW 525i 528i 530i
2004-2005 E60 BMW 525i 530i 
2004-2006 E83 BMW X3 2.5i X3 3.0i 
2000-2006 E53 BMW X5 3.0i 
1997-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe 
2003-2005 Z4 BMW Z4 2.5i Z4 3.0i 

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Bav Auto Crankshaft Pulley Holding Tool
Bav Auto Crankshaft Pulley Holding Tool
For Dual-VANOS "TU" Engines Only
10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!
Bav Auto Tools - Corporate Logo
T#:580404
Part#: B8800094
Ships on Jan 29, 2027
Sale - Save 10% $ 184.99

This product was last offered at the strikethrough price on
11-07-2026

$ 166.49 USD
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Sale - Save 10%
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This product was last offered at the strikethrough price on
11-07-2026

$ 166.49 USD
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Bav Auto's Crankshaft Pulley Holding Tool enables you to remove your crankshaft nut/bolt with ease - we recommend this tool if you intend on replacing timing chains, oil pump chains, leaking crankshaft seals, etc.
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BE Bearings Connecting Rod Bearing Upgrade Set - SP1534F - BMW S54
BE Bearings Connecting Rod Bearing Upgrade Set - SP1534F - BMW S54 ...
BE Bearings - Corporate Logo
T#:403644
Part#: SP1534HKSTDS54
Ships on Dec 10, 2026
$ 399.00 USD
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NOTE: These bearings are now sold as SP1534F which features a new and improved silver oxide coating that is stronger and more durable! Designed and manufactured by Clevite to BE Bearing specifications. These bearings replace the factory BMW rod bearings. The original BMW bearings have too little clearance, which leads to premature bearing wear and can cause early engine failure. Furthermore, the factory BMW bearings are made from tin-aluminum which are 5-times harder than a softer lead-copper bearing design. A softer bearing is better for your engine and more tolerant of foreign particles suspended in your oil. These BE Bearings feature a state-of-the-art Clevite Tri-Metal design with the Clevite Tri-Armor(tm) coating. Lead-copper design for greater durability and easy tracking with oil analysis like Blackstone (recommended). Designed with extra clearance to "fix" the BMW rod bearing design flaw. Designed for use with factory 10W60 weight oils. Tri-Armor coated for low conditions during cold start Ideal for start-stop vehicles Applicable for BMW engines S54 Standard size Sold as complete set (6-cylinders) Fits the following BMWs: 2002-2006 E46 BMW M3 S54 2002-2003 Z3 BMW M Coupe, M Roadster S54 2006-2008 Z4 BMW M Coupe, M Roadster S54
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BMW S54 VAC Performance Coated Rod Bearing Kit
BMW S54 VAC Performance Coated Rod Bearing Kit
VAC Motorsports - Corporate Logo
T#:7164819
Part#: VAC-HPRBS-S54
Ships on Nov 30, 2026
$ 479.99 USD
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BMW S54 VAC Performance Coated Rod Bearing Kit is highly regarded by BMW engine builders worldwide for its superior quality and performance. Ideal for both forced induction and naturally aspirated builds, these coated bearings are designed to be friction-resistant, reducing the risk of thermal breakdowns due to inadequate lubrication. This feature significantly decreases the chances of premature engine failure in street cars and minimizes the risk of spun bearings during high-stress track conditions.

The VAC Performance Coated Rod Bearing Kit is proven to help maintain engine reliability, even in situations with reduced oil pressure.

  • Enhanced Durability: Coated bearings are friction-resistant, reducing the risk of thermal breakdown.
  • Increased Reliability: Helps prevent premature engine failure and spun bearings under stress.
  • Versatile Performance: Suitable for both forced induction and naturally aspirated engine builds.
  • Proven Track Record: Tested by customers to ensure reliable performance even with oil pressure loss.

VAC Tech Notes:

  • Ensure proper tolerance and size checks before installation.
  • Professional installation is recommended due to specialized tools required.
  • Returns are not available on any engine bearings.
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S54/S5X/M5X/M20/M44 WPC Treated BMW Engine Crankshaft Main Bearing Set (Standard/Yellow Shell)
S54/S5X/M5X/M20/M44 WPC Treated BMW Engine Crankshaft Main Bearing Se...
10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!
ECS - Corporate Logo
T#:585720
Part#: 11211706847WPCKT
In Stock
Sale - Save 5% $ 250.99

This product was last offered at the strikethrough price on
11-07-2026

$ 238.44 USD
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Sale - Save 5%
$ 250.99

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11-07-2026

$ 238.44 USD
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What's better than using new crank bearings in your next engine build? WPC-treated bearings! What is WPC, you ask? WPC is a surface treatment that reduces friction and adds strength - two improvements that benefit internal engine components. Ultra-fine particles are fired at the surface at very high speeds, like shot-peening - but much, much smaller. The parts come out smoother and stronger due to thermal discharge. The two largest enemies of any high-performance engine are heat and friction - and WPC has found a way to reduce both. What are you waiting for? Use WPC-treated bearings on your next engine build or crank service!
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MAHLE PowerPak Piston Kit 87.50mm - S54 - 3.2L
MAHLE PowerPak Piston Kit 87.50mm - S54 - 3.2L
Mahle Motorsports - Corporate Logo
T#:2929003
Part#: 930000045
Back Ordered
$ 1,088.99

This product was last offered at the strikethrough price on
11-04-2026

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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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BMW M54 3.0l MAHLE Forged Piston Kit 84.127mm
BMW M54 3.0l MAHLE Forged Piston Kit 84.127mm
Mahle Motorsports - Corporate Logo
T#:2928980
Part#: 197843112
In Stock at Vendor
$ 1,004.99 USD
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Forged 4032. Get the performance and reliability your M54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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MAHLE Forged Piston Set 87mm - S54 - 3.2L
MAHLE Forged Piston Set 87mm - S54 - 3.2L
Mahle Motorsports - Corporate Logo
T#:2958764
Part#: 930286125
Back Ordered
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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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BMW M50 M52 S50 S52 Shrick Camshaft Set 276 intake / 270 exhaust
BMW M50 M52 S50 S52 Shrick Camshaft Set 276 intake / 270 exhaust ...
For single-VANOS M52 2.8L only
VAC Motorsports - Corporate Logo
T#:4731086
Part#: SCH-CSS-S52-276/
Ships in 2 Business Days
$ 2,640.99

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Elevate your BMW's engine performance with Schrick's premium camshafts, crafted with over 40 years of dedication to excellence. Catering to both street and track enthusiasts, Schrick ensures top-quality materials for strength and accuracy. This renowned brand has formed a lasting bond with BMW enthusiasts, providing advanced camshaft options that have stood the test of time.

  • Premium Schrick camshafts for BMW
  • Over 40 years of dedicated engine performance expertise
  • Ideal for both street and track applications
  • Top-quality materials for strength and accuracy
  • Trusted by BMW enthusiasts worldwide
  • Advanced engine testing and manufacturing technology
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MAHLE PowerPak Piston Kit 87.50mm with Thermal Barrier Coating (TBC) - S54 - 3.2L
MAHLE PowerPak Piston Kit 87.50mm with Thermal Barrier Coating (TBC) ...
Mahle Motorsports - Corporate Logo
T#:2929008
Part#: 930000145T
Special Order: No Guaranteed ETA
$ 1,271.99 USD
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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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MAHLE PowerPak Piston Kit 87.50mm with Thermal Barrier Coating (TBC) - S54 - 3.2L
MAHLE PowerPak Piston Kit 87.50mm with Thermal Barrier Coating (TBC) ...
Mahle Motorsports - Corporate Logo
T#:2929004
Part#: 930000045T
Special Order: No Guaranteed ETA
$ 1,271.99 USD
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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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MAHLE PowerPak Piston Set 87mm with Thermal Barrier Coating (TBC) - S54 - 3.2L
MAHLE PowerPak Piston Set 87mm with Thermal Barrier Coating (TBC) - S...
Mahle Motorsports - Corporate Logo
T#:2958763
Part#: 930286125T
Special Order: No Guaranteed ETA
$ 1,271.99 USD
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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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MAHLE PowerPak Piston Set 87.25mm - S54 - 3.2L
MAHLE PowerPak Piston Set 87.25mm - S54 - 3.2L
Mahle Motorsports - Corporate Logo
T#:2929006
Part#: 930000135
Ships in 2 Business Days
$ 1,088.99

This product was last offered at the strikethrough price on
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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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MAHLE PowerPak Piston Kit 87.25mm with Thermal Barrier Coating (TBC) - S54 - 3.2L
MAHLE PowerPak Piston Kit 87.25mm with Thermal Barrier Coating (TBC) ...
Mahle Motorsports - Corporate Logo
T#:2958765
Part#: 930286135T
Special Order: No Guaranteed ETA
$ 1,271.99 USD
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Achieve enhanced performance and reliability for your BMW S54 engine with the MAHLE Motorsports PowerPak Piston Kit. This kit replaces the factory cast aluminum pistons with robust forged pistons, offering superior strength and durability. MAHLE forged pistons are engineered to withstand extreme heat, detonation, and pressure, making them ideal for high-performance engines. MAHLE Motorsport's PowerPak and PowerPak+ piston kits ensure exceptional reliability and performance, elevating your BMW engine build to new heights. The range includes BMW piston sets in 2618, 4032, and M142 alloys, catering to N54, S54, and Mini Cooper models. These piston sets come complete with pins, clips, and rings, designed for both motorsport applications and those seeking to enhance daily driver performance. Notably, the latest addition is the B58 3.0L, featured in the 2020 Toyota Supra. Drawing on over 95 years of performance expertise and employing MAHLE-manufactured machinery for unique features, MAHLE Motorsport ensures uncompromising quality.
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MAHLE PowerPak Piston Set 87.25mm with Thermal Barrier Coating (TBC) - S54 - 3.2L
MAHLE PowerPak Piston Set 87.25mm with Thermal Barrier Coating (TBC) ...
Mahle Motorsports - Corporate Logo
T#:2929005
Part#: 930000135T
Special Order: No Guaranteed ETA
$ 1,271.99 USD
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$ 1,271.99 USD
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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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MAHLE PowerPak Piston Kit 87.5mm - S54 - 3.2L
MAHLE PowerPak Piston Kit 87.5mm - S54 - 3.2L
Mahle Motorsports - Corporate Logo
T#:2958767
Part#: 930286145
Ships on Nov 30, 2026
$ 1,088.99

This product was last offered at the strikethrough price on
11-04-2026

$ 1,075.99 USD
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$ 1,075.99 USD
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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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MAHLE PowerPak Piston Kit 87.25mm with Thermal Barrier Coating (TBC) - S54 - 3.2L
MAHLE PowerPak Piston Kit 87.25mm with Thermal Barrier Coating (TBC) ...
Mahle Motorsports - Corporate Logo
T#:2958768
Part#: 930286145T
Special Order: No Guaranteed ETA
$ 1,271.99 USD
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Forged, 2618. Get the performance and reliability your S54 needs with MAHLE Motorsports PowerPak Piston Kit. Replacing the weaker factory cast aluminum pistons with the strength and durability of a forged piston.
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