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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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MMX F56 Under Body Brace - Rear Section
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
MMX Performance - Corporate Logo
T#:4224078
Part#: MMR13-1401-R
In Stock
$ 212.99 USD
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$ 212.99 USD
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Genuine BMW Set Of Alu. Screws Engine Su - 22110392551
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Genuine BMW - Corporate Logo
T#:21754
Part#: 22110392551
In Stock
6% off MSRP $ 31.99

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

$ 29.99 USD
Free Shipping on orders $49 and up
6% off MSRP
$ 31.99

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

$ 29.99 USD
Free Shipping on orders $49 and up


Genuine BMW Set Of Alu. Screws Engine Support -
This item fits the following BMW Chassis:
E70 X5,E82,E83 X3,E85,E86,E89 Z4,E90,E92,E93,F10,F25 X3

Genuine BMW Strut Tower Brace Center Mount - E90 M3, E92 M3, E82 1 M ...
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Genuine BMW - Corporate Logo
T#:115813
Part#: 51618045860
In Stock
Sale - Save 5% $ 135.99

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

$ 128.52 USD
Free Shipping
Sale - Save 5%
$ 135.99

This product was last offered at the strikethrough price on
06-25-2026

$ 128.52 USD
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Enhance your BMW's performance and stability with the Genuine BMW Strut Tower Brace Center Mount for E90 M3, E92 M3, E82 1 M Coupe, and E93 M3. Crafted to BMW's exact specifications, this authentic center mount ensures optimal fit and structural reinforcement for your BMW. Improving handling and reducing body flex, it enhances overall driving dynamics and cornering stability. Whether you're tackling tight corners or enjoying spirited driving, trust Genuine BMW parts to elevate your BMW's performance and driving experience.

  • Genuine BMW strut tower brace center mount for superior quality
  • Crafted to BMW's exact specifications for perfect fit
  • Improves handling and reduces body flex
  • Enhances driving dynamics and cornering stability
  • Compatible with E90 M3, E92 M3, E82 1 M Coupe, and E93 M3 models


Genuine BMW Mount For Strut Brace -
This item fits the following BMW Chassis:
E90,E92,E93

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Burger Motorsports Billet Strut Cross Braces - Black - G20 M340i 330i...
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Burger Motorsports - Corporate Logo
T#:637424
Part#: BMSG20BSCB-BLK
Ships in 7 Business Days
$ 199.00 USD
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$ 199.00 USD
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Constructed from lightweight billet aluminum with the BMS logo engraved on the top middle. These strut braces are a solid one-piece design. These give an exclusive look under the hood and extra stabilization to the chassis.
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Rear Subframe Reinforcement Kit
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Active Autowerke - Corporate Logo
T#:397247
Part#: 13-005
Ships in 3 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
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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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Karbonius E46 M3 / 3-Series Carbon FIber Strut Brace
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Karbonius Composites - Corporate Logo
T#:28104800
Part#: E46SB01CF
Ships on Jul 29, 2026
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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Genuine BMW Rear Shock Mount Repair And Reinforcement - Left - E31 ...
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Genuine BMW - Corporate Logo
T#:71254
Part#: 41148152998
Ships in 2 Business Days
$ 28.99 USD
Free Shipping on orders $49 and up
Genuine BMW SUPPORT FOR SHOCK ABSORBER R
Genuine BMW Spring perch
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Genuine BMW - Corporate Logo
T#:25185
Part#: 31336788776
Ships in 2 Business Days
13% off MSRP $ 219.99

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

$ 190.99 USD
Free Shipping
13% off MSRP
$ 219.99

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

$ 190.99 USD
Free Shipping


Genuine BMW Support Bearing Flange -
This item fits the following BMW Chassis:
E70 X5,E71


E46 Rear Sway Bar Reinforcement Kit
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Turner Motorsport - Corporate Logo
T#:4200
Part#: TSU4675461
In Stock
Sale - Save 21% $ 70.99

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

$ 56.02 USD
Free Shipping on orders $49 and up
Sale - Save 21%
$ 70.99

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

$ 56.02 USD
Free Shipping on orders $49 and up
Made in the USA The BMW E46 3-Series chassis is one of the most rigid and well built BMW chassis to date. Even so, it still has some of the traditional BMW weak points. One of these is the rear sway bar / swaybar mounts. From chassis to chassis the problem has not been identical, but all the damage we have seen has been related to metal fatigue. The metal fatigue is due to the constant twisting and side loading of the sway bar. These forces on the sway bar will cause the mounting points to fail over time. The failure can happen faster with sway bar bind due to improper maintenance of the bushings. However, proper sway bar bushing maintenance does not totally eliminate the problem. In the case of the E46 the sheet metal for the bushing bracket does not have enough material to support the loads being transferred to the subframe. We have designed the reinforcement to strengthen and redirect the load to stronger sheet metal. Requires Welding. Does not fit M3.

Click here for installation instructions.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
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Genuine BMW Structural Reinforcement Panel - F80 F82 F83
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Genuine BMW - Corporate Logo
T#:194819
Part#: 31102284631
In Stock
4% off MSRP $ 347.99

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

$ 332.99 USD
4% off MSRP
$ 347.99

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

$ 332.99 USD


Genuine BMW Structural Reinforcement Panel -
This item fits the following BMW Chassis:
F80 M3,F82 M4,F83

Burger Motorsports Billet Strut Cross Braces - Silver - G20 M340i 330...
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Burger Motorsports - Corporate Logo
T#:637423
Part#: BMSG20BSCB-SIL
Ships on Jul 28, 2026
$ 255.99 USD
Free Shipping
$ 255.99 USD
Free Shipping
Constructed from lightweight billet aluminum with the BMS logo engraved on the top middle. These strut braces are a solid one-piece design. These give an exclusive look under the hood and extra stabilization to the chassis.
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Active Autowerke "G-Brace" - G80 G82 G83 G87 M2 M3 M4 S58
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Active Autowerke - Corporate Logo
T#:25109039
Part#: AAG8XGBRACE
Ships in 3 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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