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    BMW E85 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.
    You're currently viewing parts for your (E85/E86) Z4 2003-2008. Reset your chassis
    For accurate results, specify your year and model below.
    Made in the USAIf 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
    Part #: TSU9975002
    Price: $34.95 (USD) 
    Quantity:   
    Made in the USAThe 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
    Part #: TDR4675F99
    Price: $44.95 (USD) 
    Quantity:   
    The ORIGINAL rear trailing arm bushing / RTAB shim kit -- and still the best! As Used on Project E36 M3
    Made in the USA The Turner rear trailing-arm bushing limiter kit creates a stiffer rear suspension without sacrificing ride quality. Stock trailing arm bushings are known for failure, on both the E36 and E46 BMW chassis. This kit is a perfect upgrade from stock, as it reduces bushing deflection, dramatically increases bushing life, improves handling, and all without the harshness of "race-only" bushings, and while maintaining completely silent operation -- no squeaks and no vibration, whatsoever.

    By combining these limiters with stock bushings, this is a great low cost and effective suspension performance enhancer. Each pair of blue aluminum "shims" essentially sandwich the stock rubber bushing to control their lateral movement. By limiting the amount of side-to-side play of the stock bushing, drivers will have increased driver feel thanks to the reduction of toe variation caused by the squirm of the stock rubber bushings. This also reduces duress on the bushing, giving your newly installed bushings a dramatically longer lifespan (a welcome benefit for both pure street or tracked cars). Some stock class racing series even allow this kind of modification, because the stock bushing is still being used.

    Kit includes: 4-black anodized aluminum bushing limiters, eight 5mm allen bolts and a drilling template.

    Need bushings? Click here for replacement trailing arm bushings.

    Click for installation instructions.

    This RTAB limiter / shim kit fits the following BMWs:
    1992-1999 E36 3 Series including 318i, 318is, 325i, 325is, 328i, 328is & 323is
    1995-1999 E36 M3 3.0 & 3.2 (coupe & sedan)
    1999-2005 E46 3 Series including 323i, 323Ci, 325i, 325Ci, 325xi, 328i, 328Ci, 330i, 330xi & 330Ci
    2001-2006 E46 M3 coupe & convertible
    2004-2011 X3 2.5, 3.0
    2003-2009 Z4 Roadster & Coupe (2.5, 3.0, 3.0si)
    2006-2009 MZ4 M Roadster / M Coupe
    Part #: TSU9990001
    Regular Price: $89.95 (USD)
     Sale Price: $74.95 (USD) 
    Quantity: