E46 Rear Coilover Reinforcement Plates F11 Give your car the best

Give your car the best control arm mount without compromise using the Garagistic BMW E30 and E36 adjustable front control arm mount

find that HERE

BMW offered an upper strut mount reinforcement plate from the factory as "the poor road package" (part number 51717036781)

The E46 had rear cast aluminum arms which will not hold up to the load focused on the center with a coilover setup

E46 Rear Coilover Reinforcement Plates F11 Give your car the bestThe E46 had rear cast aluminum arms which will not hold up to the load focused on the center with a coilover setup. Why is this? It was designed for a spring which would sit on a larger area (spreading the load over the arm). Coilover springs are not only smaller in diameter but are also usually stiffer. This means that the load will be focused in a much smaller surface and WILL brake the cast aluminum arms. Protect your self and your E46!