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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.

Genuine BMW Structured Foam 400Ml - 83190007361
Genuine BMW Structured Foam 400Ml - 83190007361
This is used to help reinforce the subframe and its mount...
Genuine BMW - Corporate Logo
T#:169900
Part#: 83190007361
In Stock
16% off MSRP $102.30
$85.44
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16% off MSRP $102.30
$85.44
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This is used to help reinforce the subframe and its mounting points. The extra strength helps prevent cracking and splitting in certain weak points that were later identified by BMW and remedied by using this for support.


Genuine BMW Structured Foam - 400Ml

E46 Rear Chassis/Subframe Reinforcement Kit
E46 Rear Chassis/Subframe Reinforcement Kit
The E46 rear driveline and suspension are very similar to...
Turner Motorsport - Corporate Logo
T#:91
Part#: TDR4675412
In Stock
$139.95
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The E46 rear driveline and suspension are very similar to that of the E36. An unfortunate side effect of this is that the E46 also shares some of the same problems as the E36. One of these problems is the rear mounting points for the subframe, which can rip out from their spots in the sheet metal. This happens because the rear differential transmits the torsional load from the engine through the subframe, then into the chassis. This constant loading and unloading weakens the sheet metal and causes it to fatigue and separate from the chassis. BMW tried to fix this problem in the E46 by placing a cross member on the front two mounting points of the subframe. This cross member keeps the front mounting points from having problems by placing the bushing and the stud in double-sheer, thus reducing the twisting action on the sheet metal. The unfortunate side effect of this is that the load from the front of the subframe now gets transmitted to the left rear of the subframe. This is where we have seen many failures of the chassis on low mileage street cars and race cars. BMW has also tried to prevent the issue by injecting foam into the open space between the underside of the chassis and the top of the trunk. This seems to work but that does not address the issues of the spot welds failing on the sheetmetal. It can also make any additional work there harder and almost impossible to weld against. Our reinforcement kit has proven over and over again to be effective and the easiest to work with in the long run.

This product reinforces the chassis sheet metal at the subframe mounting points. We do this by thickening the metal and distributing the load over a larger area. This kit will save time when repairing the chassis, and is also strongly recommended as a preventative maintenance item.

Photo Gallery: E46 Subframe Failure / Repair

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 M3
E36, E46 Rear Shock Tower Mount Reinforcement Kit
E36, E46 Rear Shock Tower Mount Reinforcement Kit
A very common weak point on the 3 series BMW is the sheet...
Turner Motorsport - Corporate Logo
T#:3440
Part#: TSU9975100
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$32.95
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Made in the USA 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.

This item fits the following BMWs:
1992-1999 E36 BMW 318i 318is 318ti 323is 325i 325is 328i 328is M3 - not for convertibles
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3 - not for convertibles

Turner Motorsport Rear Trailing Arm Bushing Limiter Kit (RTAB Shim Kit)
Turner Motorsport Rear Trailing Arm Bushing Limiter Kit (RTAB Shim K...
Turner Motorsport Bushing Limiters were the first - and s...
Turner Motorsport - Corporate Logo
T#:964
Part#: TSU9990001
In Stock
Sale - Save 20% $89.95
$71.96
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Turner Motorsport Bushing Limiters were the first - and still the best - RTAB Limiter on the market. Instead of a 'floating' design that can rattle and wear, our aluminum Limiters are fixed in place and feature an anti-stick Teflon coating so the bushing never sticks and squeaks.

The great defect in the rear trailing arm bushing (RTAB) is that the soft rubber design allows too much movement and extension during cornering. The bushing is not strong enough to resist hard cornering loads. A stiffer bushing helps but has trade-offs in ride and comfort. If you want to maintain your ride comfort with rubber bushings, these RTAB Limiters will prolong their life and improve handling.

These Limiters sit on either side of the bushing and limit its movement. By limiting motion the bushing effectively becomes stiffer, improving handling and reducing toe change during cornering. When not cornering, the Limiters are not in play so ride comfort remains the same as stock. Our Limiters are permanently bolted to the housing that surrounds the bushing. Other types of Limiters 'float' between the bushing and housing, which can rattle and squeak as the bushings move. Instead of plastic or Delrin that will wear over time, our RTAB Limiters are made from aluminum with a tough hardcoat anodize (tougher than standard anodizing) and finished with a Teflon anti-stick coating.

Turner RTAB Limiter Kit includes -

  • set of 4 anodized aluminum bushing limiters
  • 5mm Allen bolts and washers
  • install template

Need E36/E46 RTAB bushings? Click here for replacement trailing arm bushings.

Click for installation instructions.

This item fits the following BMWs:
1992-1999 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1999-2006 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
2003-2010 E83 BMW X3 2.5 X3 3.0 X3 3.0si
2002-2008 E85 E86 BMW Z4 2.5 Z4 3.0 Z4 3.0i Z4 3.0si Z4 M Coupe Z4 M Roadster


E46 Front Subframe Reinforcement Kit
E46 Front Subframe Reinforcement Kit
The motor mount area on a subframe is one of those easily...
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T#:631
Part#: TDR4675F99
In Stock
Sale - Save 69% $45.95
$14.40
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Sale - Save 69% $45.95
$14.40
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Made in the USA The motor mount area on a subframe is one of those easily-forgotton areas that may be hiding a serious problem. The subframe on the E46 has a gusset ('ear') welded on for the motor mounts. These gussets take the stress of the motor mount as the engine torques (more upgrades = more torque = more stress). Worn motor mounts only transfer more stress to the subframe. Unfortunately, the sheetmetal will fatigue over time even though the gusset is reinforced from the factory. Check for cracks along the welds and an uneven plane from the subframe to the gusset. A total failure of the guesset will shift your engine to the side and forward, taking out many other components along the way and leading to a very costly repair.

The next time you replace the motor mounts, oil pan gasket, checking your oil pump nut, or any other time you drop the front subframe, you should install these reinforcements. This kit comes with steel reinforcing plates that are welded to the underside of the guesset as well as plates to close off the bottom of the gusset for extra strength. Instructions included.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 328i 328ci 330i 330ci M3
E36 Front Subframe Reinforcement Kit
E36 Front Subframe Reinforcement Kit
The motor mount area on a subframe is one of those easily...
Turner Motorsport - Corporate Logo
T#:3642
Part#: TDR3675301
In Stock
$45.95
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Made in the USA The motor mount area on a subframe is one of those easily-forgotton areas that may be hiding a serious problem. The subframe on the E36 has a gusset ('ear') welded on for the motor mounts. These gussets take the stress of the motor mount as the engine torques (more upgrades = more torque = more stress). Worn motor mounts only transfer more stress to the subframe. Unfortunately, the gusset is not well-reinforced from the factory and cracks can develop along the welds and the gusset begins to collapse. A total failure of the guesset will shift your engine to the side and forward, taking out many other components along the way and leading to a very costly repair.

The next time you replace the motor mounts, oil pan gasket, checking your oil pump nut, or any other time you drop the front subframe, you should install these reinforcements. This kit comes with steel reinforcing plates that are welded to the underside of the guesset as well as plates to close off the bottom of the gusset for extra strength. Instructions included (or see the link below).

Click Here for Installation Instructions.

This item fits the following BMWs:
1992-1998 E36 BMW 318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1997-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe

E36 Rear Sway Bar Reinforcement Kit
E36 Rear Sway Bar Reinforcement Kit
E36 cars with swaybar upgrades will develop cracks where ...
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T#:3644
Part#: TSU3675001
In Stock
$40.95
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Made in the USA E36 cars with swaybar upgrades will develop cracks where the swaybar bushing mounts to the subframe. The problem becomes worse for cars that are tracked or drifted. Because the swaybar tab is un-reinforced from the factory, you can end up with flexing and twisting which will eventually weaken the welds and snap the tab from the subframe. By welding in this reinforcement you can prevent the mount from twisting. This will go a long way towards preventing a bothersome repair down the road.

Click here for installation instructions.

This item fits the following BMWs:
1992-1998 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
E30, Z3 Rear Sway Bar Lower Link Reinforcement Kit
E30, Z3 Rear Sway Bar Lower Link Reinforcement Kit
This product reinforces the metal swaybar link mounting p...
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T#:3775
Part#: TSU3075305
In Stock
Sale - Save 83% $25.95
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Made in the USA This product reinforces the metal swaybar link mounting point on the rear trailing arm. The sheet metal breaks off the trailing arm due to the constant up and down loads being placed on the trailing arm from the swaybar. Problems increase when larger sway bars are used. This product eliminates the problem by thickening the sheet metal and triangulating the mounting point. A good time to install this kit would be when you are doing any rear suspension work, exhaust, or even if you are just doing a differential fluid change. This part requires welding for installation.

Click here for installation instructions.

This item fits the following BMWs:
1984-1991 E30 BMW 318i 318is 318ic 325e 325es 325i 325ic 325is 325ix M3
1997-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe

E30 Rear Sway Bar Reinforcement Kit
E30 Rear Sway Bar Reinforcement Kit
Save 20%A suspension mount is designed to take the stress...
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T#:4054
Part#: TSU3075308
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$127.95
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A suspension mount is designed to take the stress and force of a suspension. A modified suspension, however, puts more stress on that mount. Time is not kind to mounts either, especially when they're metal and have been exposed to the elements. In the E30 rear sway bar, the bushing mounts to a tab coming off the rear trunk floor. Unfortuntately, the tab is insufficiently reinforced from the factory. As the tab flexes it will stress and tear the mounting tab off the chassis. A car that is babied and not driven hard may not suffer from this failure. But most E30s are in enthusiast hands now and are driven aggressively. If you don't reinforce the rear swaybar bushing mount IT WILL fail - no doubt about it.

This kit includes two factory U-shaped brackets with extra gusset reinforcement, installation hardware, and instructions. Each reinforced bracket bolts to your car's trunk (drilling required). Any sway bar bushing designed to be used with the stock bushing brackets will work with our kit, making this compatible with many sway bar upgrade packages!

This item fits the following BMWs:
1984-1991 E30 BMW 318i 318is 318ic 325e 325es 325i 325ic 325is 325ix M3


E30 Front Subframe Reinforcement Kit
E30 Front Subframe Reinforcement Kit
As E30s get older they develop cracks and bends in places...
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T#:4079
Part#: TDR3075001
In Stock
$30.95
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As E30s get older they develop cracks and bends in places that see a lot of stress. One of the most stressful areas is the front subframe, especially because of worn motor mounts. A sure sign that your subframe is not holding up is that paint will chip and peel from the stressed area. It's a good idea to reinforce your front subframe the next time you're doing any suspension work and a must when replacing motor mounts.

This kit installs on the underside of the motor mount gusset and reinforces the upper sheetmetal of the gusset as well as closing off and reinforcing the lower section. Requires welding. Kit includes 2 motor mount reinforcements, 2 subframe "ear" reinforcements, and instructions.

This item fits the following BMWs:
1984-1991 E30 BMW 318i 318is 318ic 325e 325es 325i 325ic 325is M3
E82, E9X Front Strut Tower Reinforcement Plates (Pair)
E82, E9X Front Strut Tower Reinforcement Plates (Pair)
Help preserve the structural integrity of your BMW E82 1-...
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T#:2720
Part#: TSU9075STR
In Stock
$50.95
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Made in the USA Help preserve the structural integrity of your BMW E82 1-series, or E90, E91, E92, or E93 3-series with these weld-in strut tower reinforcement plates. Deformation of the front upper strut tower has been common problem, especially in race-prepped cars, cars with lowered suspensions, any car that sees track use, or BMWs driven on rough roads. The strut tower deforms from suspension bottoming out, forces generated by the spring/shock assembly, and that forced concentrated in a relatively small area on the strut tower. The strut tower will exhibit deforming by cracking (especially around the stud holes), or "mushrooming" where the tower takes on a dome-shaped top instead of being flat. By thickening the sheetmetal material of the tower, you are making it stronger and more robust to prevent deformation. While the E82 and E9x cars are newer and better made than the previous E36 and E46 cars, any suspension modification or track use will make the new cars more susceptible to this problem.

These are mounted on the underside of the strut tower and need to be welded into place.

This chassis reinforcement fits the following BMWs:
2008+ E82 BMW 128i 135i
2006+ E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi 335i 335xi 335i xDrive M3
2007+ E92 BMW 328i 328xi 328i xDrive 335i 335is 335xi 335i xDrive M3
2007+ E93 BMW 328i 328xi 328i xDrive 335i 335xi 335i xDrive M3
E36, E46, Z4 Turner Motorsport Camber Arm Reinforcement Kit
E36, E46, Z4 Turner Motorsport Camber Arm Reinforcement Kit ...
If you haven't already upgraded to <a&...
Turner Motorsport - Corporate Logo
T#:1132
Part#: TSU9975002
In Stock
$35.95
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Made in the USA If you haven't already upgraded to Adjustable Camber Arms , your stock rear lower wishbones are letting your down. The stock rear camber arm/wishbone is designed to be flexible and weak. In an impact, it's designed to bend or even break to absorb energy and prevent damage to other more vital components. This is great on a regular street car. But on a track car, or heavily modified street car, these arms can bend just from cornering forces and that can introduce radical camber changes that will throw off the balance and handling of the car. This reinforcement solves all of that by tying the two sections of the arm together. This creates a single solid arm with minimal flex in the arm itself. We can't take credit for this innovation - BMW recognized the problem and did this on their factory Group N racecars. If you haven't made the jump to adjustable arms, or your racing class still requires the stock camber arm, then this kit is a must! Installation requires welding.

Click here for installation instructions

This item fits the following BMWs:
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 M3
2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si Z4 M Roadster M Coupe


E46 Rear Sway Bar Reinforcement Kit
E46 Rear Sway Bar Reinforcement Kit
The BMW E46 3-Series chassis is one of the most rigid and...
Turner Motorsport - Corporate Logo
T#:4200
Part#: TSU4675461
In Stock
$40.95
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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
E30 M3 Front Sway Bar Reinforcement Kit
E30 M3 Front Sway Bar Reinforcement Kit
Every E30 M3 that comes into our shop gets the front sway...
Turner Motorsport - Corporate Logo
T#:3415
Part#: TSU3075312
In Stock
Sale - Save 73% $15.95
$4.33
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Sale - Save 73% $15.95
$4.33
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Made in the USA Every E30 M3 that comes into our shop gets the front swaybar tab inspected. This is such a common problem but with an easy fix. If left to worsen you may be looking at an entire strut housing replacement. Fix it now with these reinforcing plates and a little welding! Not only will modified suspensions put stress on the mounts but age will reduce their strength as well. Reinforcing the swaybar mount to the strut will keep your swaybar geometry in spec and prevent a costly and ugly repair.

This item fits the following BMWs:
1987-1991 E30 BMW M3
E46 Strut Tower Reinforcement Plates - priced each
E46 Strut Tower Reinforcement Plates - priced each
Like the E36 before it, the front strut towers on the E46...
Genuine BMW - Corporate Logo
T#:323
Part#: 51717036781
In Stock
16% off MSRP $13.44
$11.28
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16% off MSRP $13.44