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BMW Chassis Reinforcement Kits & Parts

Made in the USAAs much of an "Ultimate Driving Machine" it is, many BMW models unfortunately suffer from weak points in the chassis. Over the years we have uncovered many weak or failure-prone areas in the chassis and have developed our own reinforcing solutions for them. And we continue to be the leading experts on BMW chassis reinforcing. Failures can come from a number, or combination, of causes: improper maintenance, age and mileage, poor design, environmental factors, poor repair work, and over-stressing modifications. The longer you let your car go without repairing or reinforcing these areas, the closer it gets to crumbling apart. Our chassis reinforcement kits are designed to first identify potential weak points and then strengthen and reinforce the existing design.

Most of our kits are not labor intensive although welding is usually required. If you suspect your chassis may have structural problems we recommend taking it to a well-known bodyshop or restoration shop. (find out who your local BMW dealer uses - we sell many of our kits to dealer-authorized repair shops). Making the preventative fix simple and effective is better than a long and complicated repair after the failure. Our kits are not usually used for fixing existing damage (only your body shop can determine the correct course of action). But our kits have been proven under extreme conditions on racetracks around the world to prevent many of the costly - and dangerous - chassis problems.

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Active Autowerke - Corporate Logo
T#:4070463
Part#: F-BRACE
Ships in 2 Business Days
$ 99.00

This product was last offered at the strikethrough price on
02-23-2026

$ 94.00 USD
Free Shipping
$ 94.00 USD
Free Shipping

BMW F8X M2 M3 M4 Chassis Bracing

The BMW F8X M2 M3 M4 Chassis Bracing is designed to enhance the rigidity and stability of the chassis, providing improved handling and performance for your BMW. Turner Motorsport offers this high-quality brace to support better driving dynamics and reduced flex during aggressive driving.

Benefits:

  • Enhanced Rigidity: Significantly increases chassis stiffness, leading to improved handling and reduced body roll.
  • Improved Stability: Minimizes chassis flex for more precise steering responses and better overall control.
  • High-Quality Construction: Made from durable materials to ensure long-lasting performance and reliability.
  • Easy Installation: Designed for straightforward installation with minimal modifications required.
  • Optimized Performance: Perfect for both street and track use, enhancing the driving experience and vehicle performance.
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Karbonius Composites - Corporate Logo
T#:28104800
Part#: E46SB01CF
Ships in 9 Business Days
Starting at $ 1,195.00 USD
Free Shipping on orders $49 and up
Starting at $ 1,195.00 USD
Free Shipping on orders $49 and up
A strut tower bar is one of the most common and effective upgrades in a vehicle. With the installation of a strut brace, the body gets added structural strength, preventing tower flex and alignment changes during sporty driving or while at the race track. Improve your E46-Chassis BMW with the Karbonius Carbon Strut Brace! Karbonius Composites was inspired by the popular, but no longer available BMW Performance strut bar to create a version of their own. They have designed an extremely strong and lightweight brace that not only adds strength and stability, but also a spectacular eye-catching look. The carbon strut bar is manufactured in prepreg carbon fiber and cured in aluminum mold in an autoclave; while the strut tower caps are 5-axis CNC machined, and includes titanium strut tower nuts. Installation Instructions Product Details: Fits all E46 and M3 Offered in standard high gloss, 2x2 carbon weave Natural anodized aluminum strut tower caps 6 titanium nuts included Very light, only 1100g weight Perfect fitment and easy installation 100% carbon fiber prepreg Cured in aluminum mold and autoclave Controlled break zone Exclusive and numbered piece 2-year warranty NOTE: All pieces are numbered to guarantee authenticity and origin.
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Active Autowerke - Corporate Logo
T#:397247
Part#: 13-005
Ships in 4 Business Days
5% off MSRP $ 149.00

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

$ 142.00 USD
Free Shipping
5% off MSRP
$ 149.00

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

$ 142.00 USD
Free Shipping

One of the most common issues with the E46 is that the subframe likes to tear away from the chassis. Fix this by welding in a Rear Subframe reinforcement kit.

  • Includes all necessary reinfored metal plates
  • Professional installation is required
  • Suspension must be realigned after installation

Fits the following BMWs:
1998 - 2006 E46 320i 323i 325i 325xi 328i 330i 323ci 325ci 330ci M3 

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Active Autowerke - Corporate Logo
T#:25109039
Part#: AAG8XGBRACE
Ships in 4 Business Days
$ 284.99 USD
Free Shipping
$ 284.99 USD
Free Shipping
Active Autowerke designed this piece to allow for more clearance with aftermarket mid-pipes. Factory clearance is tight and not conducive for larger than factory diameter piping. This piece allows for more clearance without sacrificing any structural rigidity and is made from high-strength 6061 aluminum to match the strength of the OEM brace.
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Rally Road - Corporate Logo
T#:401465
Part#: B027
Ships on Aug 31, 2026
$ 152.99 USD
Free Shipping
$ 152.99 USD
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Rally Road Productions, Inc. is a team supported by a group of people with great abilities in their area of expertise. From the "web guy" and driving instructor friends, to owners of various machine shops, they have surrounded ourselves with people that can be trusted to create and manufacture quality products. This is the key to ensuring everything that they sell will perform as it was intended. The goal is to increase customer satisfaction and make the customization or performance enhancement of your vehicle a more enjoyable venture.

Have you ever snapped a transmission brace under full throttle? NOT a fun experience. For that reason, Rally Road has come up with the very last transmission brace your E36 will ever need. 

Back when the minds at BMW set out to design the E36's lower transmission support, they executed perfectly. A cast piece manufactured from lightweight aluminum would surely provide the proper support for the business end of the powertrain. This part functioned fine...mostly...when the vehicle was driven modestly. However, push it too hard and this brace becomes perfectly unusable when it snaps in half. 

This upgraded piece is manufactured out of solid steel. Laser cut, precision CNC bent, and then tig welded together - this thing is ready to take a beating. Finish it off with a flawless black powder coat and what you have is a transmission brace that is as beautiful as it is bulletproof. Whether you're considering this as an alternative to an already broken piece or just shopping for your next mod, this is a must-have for ANY E36 owner.

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Enthusiast Bundles - Corporate Logo
T#:37419763
Part#: 011902LAEBKT
In Stock
Sale - Save 9% $ 2,063.02

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

$ 1,869.00 USD
Free Shipping on orders $49 and up
Sale - Save 9%
$ 2,063.02

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

$ 1,869.00 USD
Free Shipping on orders $49 and up

Enhance your BMW’s performance and style with this unbeatable combo! The Turner Motorsport Carbon Fiber Strut Brace and Engine Cover are the ultimate pair to upgrade chassis stability and engine bay aesthetics—all with a single purchase.

G20/G42 Carbon Fiber Strut Brace

For G20 and G42 BMW models equipped with the B48 or B58 engines, the driving thrill is undeniable. Yet, these cars lack a crucial component found in high-performance M models: structural chassis bracing. With Turner Motorsport’s 3-point Carbon Fiber Strut Brace, you’re adding the missing link to your BMW, mirroring the handling stability of an M3 or M4. This is the only strut brace that elevates G20/G42 handling by emulating the stiffness of an M-series chassis, giving you a dynamic edge on both road and track.

The strut brace fits seamlessly into your BMW using the original factory hardware and an included stud kit, offering a hassle-free, direct installation with no modifications required. Designed and tested in-house by Turner Motorsport, this brace reduces chassis flex, enhancing control during spirited driving and providing a tighter, more responsive feel. Constructed from high-strength carbon fiber with billet aluminum end brackets, this strut brace boosts performance while adding an eye-catching focal point to your engine bay.

Strut Brace Features:

Enhanced Chassis Rigidity: Reduces flex by linking the strut towers, promoting a more precise steering response. Street and Track Ready: Engineered for the best of both worlds, offering stability in all driving conditions. Premium Carbon Fiber & Billet Aluminum: Lightweight yet highly rigid, with a stunning woven 2x2 twill finish. Easy Installation: Fits perfectly with stock mounting points using supplied hardware, ensuring a hassle-free setup. Carbon Fiber: Performance & Style

Turner’s strut brace uses structural carbon fiber, designed to endure the rigors of aggressive driving without compromising aesthetics. The brace's distinct, gloss-finished carbon fiber weave adds a sophisticated, high-performance look akin to exotic supercars. Engineered for precision, this brace effectively distributes cornering forces between the strut towers, minimizing chassis distortion and maintaining optimal wheel alignment, even in hard turns.

Turner Motorsport G-Chassis Carbon Fiber Engine Cover for B58 Engines

Give your G-Chassis BMW’s engine bay a polished, refined look with Turner’s Carbon Fiber Engine Cover. This direct replacement cover is crafted from hand-laid, gloss-finished carbon fiber, delivering a resilient, UV-protected finish. With an OE-style indentation for the BMW badge, this cover complements your engine bay with a sleek, factory look that stands out.

Engine Cover Highlights:

Direct Fitment: Seamlessly replaces the stock cover, utilizing factory mounting grommets and hardware. Durable Gloss Finish: Ensures long-lasting shine and UV protection. Distinctive Style: A premium upgrade that elevates the aesthetic of your B58 engine. Installation Notes:

Simply transfer the OE grommets and badge from the stock cover to the carbon fiber engine cover for a perfect fit—installation takes seconds!

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Karbonius Composites - Corporate Logo
T#:28104803
Part#: E36SB01
Back Ordered
Starting at $ 839.00 USD
Free Shipping on orders $49 and up
Starting at $ 839.00 USD
Free Shipping on orders $49 and up
Strut tower bar is one of the most common and effective upgrades in a vehicle. With installation of strut bar bodywork gets structural strength, preventing tower flex and alignment changes during sporty driving. Improve your BMW with Karbonius strut bar and prepare for people staring! In Karbonius Composites, we have inspired in E46 BMW performance strut bar to create our own strut bar. We have designed a piece extremely strong but light at the same time, what adds not only strength and stability, but also a spectacular eye-catching look. A strut bar manufactured in prepreg carbon fiber and cured in aluminum mold in autoclave; CNC machined manufactured in 5-axis machine. Standard finish includes varnish high gloss and natural aluminum anodized. Product Details: Fits all E36 and M3 2x2 weave Very light, only 1150 grs weight Perfect fitment and easy installation 100% carbon fiber prepreg Cured in aluminum mold and autoclave Controlled break zone Exclusive and numbered piece 2-year warranty NOTE: All pieces are numbered to guarantee authenticity and origin.
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Karbonius Composites - Corporate Logo
T#:26471475
Part#: G8XSB02-CF-AB
Ships in 4 Business Days
$ 3,115.00 USD
Free Shipping
$ 3,115.00 USD
Free Shipping
M4 CSL brace has been designed to enhance the sportive character of M cars, at the same time as it brings the best rigidity to the chassis. Designed and manufactured in Spain under strict quality requirements according to UNE-EN ISO 9001:2015. This piece is made by hand with the best carbon fiber prepreg. This piece is manufactured by combining craft and technology. On the one hand, with the care and attention to detail that characterizes our company, and on the other, with the use of the most modern equipment in some critical points of the process, such as 3D scanning, autoclave curing, and robotic cutting. The G8X CSL strut brace has been manufactured with monobloc tubular technology, avoiding unnecessary joints that could result in weak points. Lamination has been carefully designed, and we include 3 different fabrics, all best quality, including high-modulus unidirectional carbon. 6061 aluminum machined components complete the piece providing great resistance to wear in the area of joint to the chassis. Not just to save weight, but to achieve the strength and rigidity necessary for a functional part with similar characteristics to the OEM part. The result? A piece with an OEM finish and fitment, but with an awesome appearance and only 1.8 kilos, which is a significant weight reduction compared to the original bar which is 3.5 kilos.
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Active Autowerke - Corporate Logo
T#:51320825
Part#: 11-129
Ships in 4 Business Days
New Item
$ 332.00 USD
Free Shipping
$ 332.00 USD
Free Shipping
Active Autowerke designed this piece to allow for more clearance with aftermarket mid-pipes. Factory clearance is tight and not conducive for larger than factory diameter piping. This piece allows for more clearance without sacrificing any structural rigidity and is made from high-strength 6061 aluminum to match the strength of the OEM brace.
Show More Show Less