![]() Once the car is disassembled the body is thoroughly cleaned and prepared for repair. The exhaust, driveshaft, differential, gas tank, suspension, and rear subframe all have to be removed to access the location of the cracks. Due to the extensive nature of the repair this is not something Parts Score recommends that is done as a DIY. This repair requires extensive disassembly of the entire rear of the vehicle and expert welding skills. Even if your particular E46 M3 is not exhibiting subframe cracks we still recommend this kit as a preventative maintenance item that will save money and headaches in the future.īelow in this article we have documented the repair process for all to see. Their rear subframe reinforcement kit consists of eight 1.85mm weld in pieces of steel which distribute the load from the subframe over a larger area on the body. A large number of companies produce a reinforcement kit, in our experience we have found that Achilles Motorsports produces the highest quality and strongest kit. The best solution to this failure is to weld any existing cracks to prevent them spreading further and to weld in place thick metal reinforcement plates in the areas of highest stress. BMW has tried to address the failures over the years with a number of service campaigns that include additional bracing or even injecting foam reinforcement, these fixes are temporary at best. Rear subframe cracks for years have been a sore subject among E46 M3 enthusiasts, the failures are common enough to say its not a matter of if, but when. ![]()
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