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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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4mm Heavy Duty Rear Shock Mount Reinforcement Plate Set
4mm Heavy Duty Rear Shock Mount Reinforcement Plate Set
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
ECS - Corporate Logo
T#:376177
Part#: 002478ECS01KT
In Stock
Sale - Save 25% $ 85.99

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$ 64.48 USD
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A very common weak point on the 3 series BMW is the sheetmetal of the rear shock tower. The sheetmetal here is relatively thin and very susceptible to stress and fatigue. A worn out shock will bottom-out more often and this energy is transferred through the bump stop and into the metal chassis. Stiffer shocks and shock mounts also put more stress on the sheetmetal. Factor in age, mileage, and environmental conditions and it's not a surprise that we see shock tower failures often. BMW addressed this issue with reinforcements of their own but our's are thicker for additional strength. This kit mounts on top of the shock tower and can either be bolted or welded in place. Because of the shape of the rear shock tower, these do not fit cabrio/convertible cars. 
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Heavy Duty Convertible Rear Shock Mount Reinforcement Plate Set
Heavy Duty Convertible Rear Shock Mount Reinforcement Plate Set ...
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
ECS - Corporate Logo
T#:376176
Part#: 002478ECS02KT
In Stock
Sale - Save 25% $ 95.98

This product was last offered at the strikethrough price on
06-13-2026

$ 71.98 USD
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The upper rear shock bolts to the sheetmetal in the folding top well on convertible models. As the mileage goes up more and more stress is put on this sheetmetal and it can actually tear away from the rest of the chassis. Look for lttle cracks originating from the mouning holes. This reinforcement plate helps spread the shock loads around the sheetmetal and reduce stress in localized areas. Price is for the pair.
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Heavy Duty Rear Sway Bar Bracket Upgrade - E30
Heavy Duty Rear Sway Bar Bracket Upgrade - E30
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
ECS - Corporate Logo
T#:9222692
Part#: 016965LA
In Stock
Sale - Save 25% $ 118.99

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

Starting at $ 89.24 USD
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A major upgrade over the weak stamped steel factory sway bar brackets. These are critical for those running larger, aftermarket sway bars. Includes polyurethane bushings.
Burger Motorsports Billet Strut Cross Braces - Black - G20 M340i 330i, G42 M240i 230i
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 8 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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Burger Motorsports Billet Strut Cross Braces - Red - G20 M340i 330i, G42 M240i 230i
Burger Motorsports Billet Strut Cross Braces - Red - G20 M340i 330i, ...
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Burger Motorsports - Corporate Logo
T#:637421
Part#: BMSG20BSCB-RED
Ships on Nov 12, 2026
$ 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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Burger Motorsports Billet Strut Cross Braces - Blue - G20 M340i 330i, G42 M240i 230i
Burger Motorsports Billet Strut Cross Braces - Blue - G20 M340i 330i,...
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Burger Motorsports - Corporate Logo
T#:637422
Part#: BMSG20BSCB-BLUE
Ships on Nov 12, 2026
$ 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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ECS Strut Tower Plate Kit - Black
ECS Strut Tower Plate Kit - Black
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
ECS - Corporate Logo
T#:593980
Part#: 001717ECS01
Ships on Nov 12, 2026
$ 193.99 USD
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$ 193.99 USD
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MMX F56 Under Body Brace - Front Section
MMX F56 Under Body Brace - Front Section
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MMX Performance - Corporate Logo
T#:4224047
Part#: MMR13-1401-F
Ships in 4 Business Days
$ 195.99 USD
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$ 195.99 USD
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MMX F56 Under Body Brace - Middle Section
MMX F56 Under Body Brace - Middle Section
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MMX Performance - Corporate Logo
T#:4224050
Part#: MMR13-1401-M
Ships in 2 Business Days
$ 212.99 USD
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$ 212.99 USD
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MMX F56 Under Body Brace - Rear Section
MMX F56 Under Body Brace - Rear Section
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MMX Performance - Corporate Logo
T#:4224078
Part#: MMR13-1401-R
Ships in 4 Business Days
$ 212.99 USD
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$ 212.99 USD
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Karbonius E46 M3 / 3-Series Carbon FIber Strut Brace
Karbonius E46 M3 / 3-Series Carbon FIber Strut Brace
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Karbonius Composites - Corporate Logo
T#:28104800
Part#: E46SB01CF
Ships in 8 Business Days
Starting at $ 1,275.00 USD
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Starting at $ 1,275.00 USD
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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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Burger Motorsports Billet Strut Cross Braces - Red - BMW G22/G23/G26 430i M440i
Burger Motorsports Billet Strut Cross Braces - Red - BMW G22/G23/G26 ...
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Burger Motorsports - Corporate Logo
T#:46924996
Part#: G22BSCB-RED
Back Ordered
$ 199.00 USD
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$ 199.00 USD
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Burger Motorsports' strut braces are CNC machined from thick, lightweight billet aluminum with the BMS logo engraved on the top middle. These strut braces are a thick, solid one-piece design and give an exclusive look under the hood and extra stabilization to the chassis.
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Burger Motorsports Billet Strut Cross Braces - Silver - G20 M340i 330i, G42 M240i 230i
Burger Motorsports Billet Strut Cross Braces - Silver - G20 M340i 330...
Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Burger Motorsports - Corporate Logo
T#:637423
Part#: BMSG20BSCB-SIL
Ships on Nov 12, 2026
$ 255.99 USD
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$ 255.99 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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MINI R56 ECS Strut Tower Plate Kit - Black
MINI R56 ECS Strut Tower Plate Kit - Black
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
ECS - Corporate Logo
T#:588743
Part#: 001718ECS01
In Stock
Sale - Save 3% $ 152.99

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$ 148.40 USD
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Karbonius E36 M3 / 3-Series Carbon Strut Brace
Karbonius E36 M3 / 3-Series Carbon Strut Brace
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Karbonius Composites - Corporate Logo
T#:28104803
Part#: E36SB01
In Stock
Starting at $ 910.00 USD
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Starting at $ 910.00 USD
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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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MMX Underbody Chassis Brace - F80, F82, F83, F87
MMX Underbody Chassis Brace - F80, F82, F83, F87
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MMX Performance - Corporate Logo
T#:55713525
Part#: MMR13-1000
In Stock
New Item
$ 295.00 USD
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$ 295.00 USD
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The MMX Performance Underbody Chassis Brace is engineered specifically for the F8x platform to eliminate the unwanted flex that plagues the factory mid-section. On the track or your favorite backroad, flex alters your alignment mid-corner, reducing tire contact patch.
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iSweep Power Brace Complete Whole Kit - F55, F56, F57
iSweep Power Brace Complete Whole Kit - F55, F56, F57
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iSWEEP - Corporate Logo
T#:54388392
Part#: ISCCWK-F56
Ships in 10 Business Days
New Item
$ 807.99 USD
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$ 807.99 USD
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Don't let chassis flex compromise your MINI’s handling. From the factory, the F55, F56, and F57 platforms suffer from structural deflection under heavy cornering loads. To extract true track-ready performance and razor-sharp steering response, your chassis needs to be tied together.
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Burger Motorsports Billet Strut Cross Braces - Silver - BMW G22/G23/G26 430i M440i
Burger Motorsports Billet Strut Cross Braces - Silver - BMW G22/G23/G...
Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Burger Motorsports - Corporate Logo
T#:46924997
Part#: G22BSCB-SIL
Ships on Nov 12, 2026
$ 199.00 USD
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$ 199.00 USD
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Burger Motorsports' strut braces are CNC machined from thick, lightweight billet aluminum with the BMS logo engraved on the top middle. These strut braces are a thick, solid one-piece design and give an exclusive look under the hood and extra stabilization to the chassis.
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Burger Motorsports Billet Strut Cross Braces - Blue - BMW G22/G23/G26 430i M440i
Burger Motorsports Billet Strut Cross Braces - Blue - BMW G22/G23/G26...
Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Burger Motorsports - Corporate Logo
T#:46924998
Part#: G22BSCB-BLU
Ships on Nov 12, 2026
$ 199.00 USD
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$ 199.00 USD
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Burger Motorsports' strut braces are CNC machined from thick, lightweight billet aluminum with the BMS logo engraved on the top middle. These strut braces are a thick, solid one-piece design and give an exclusive look under the hood and extra stabilization to the chassis.
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Burger Motorsports Billet Strut Cross Braces - Black - BMW G22/G23/G26 430i M440i
Burger Motorsports Billet Strut Cross Braces - Black - BMW G22/G23/G2...
Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Burger Motorsports - Corporate Logo
T#:46924999
Part#: G22BSCB-BLK
Ships on Nov 12, 2026
$ 199.00 USD
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$ 199.00 USD
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Burger Motorsports' strut braces are CNC machined from thick, lightweight billet aluminum with the BMS logo engraved on the top middle. These strut braces are a thick, solid one-piece design and give an exclusive look under the hood and extra stabilization to the chassis.
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G8X M2 / M3 / M4 CSL Carbon Front Strut Brace
G8X M2 / M3 / M4 CSL Carbon Front Strut Brace
Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Karbonius Composites - Corporate Logo
T#:26471475
Part#: G8XSB02-CF-AB
Ships in 4 Business Days
$ 3,115.00 USD
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$ 3,115.00 USD
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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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