SPL Parts 06-13 BMW 3 Series/1 Series (E9X/E8X) Rear Upper Arm LinksStock non M arms are made from sheet metal that is merely spot welded together, which tends to flex and bend under moderate loads let alone track day or racing stresses. If you use grippier tires and an engine with more torque, then the stock arms aren't able to provide stability and consistent handling. BMW E9X E8X Rear Upper Arms, which include both the guide (traction) and camber (wishbone) arms, feature gun drilled 2024 Aluminum links that are
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SPL Parts 06-13 BMW 3 Series/1 Series (E9X/E8X) Rear Upper Arm Links