AST Suspension Lowering Springs (50mm/30mm) - 2004-2010 BMW X3 3.0D (E83) YMM_2012_2016_Porsche_911_991_1_Carrera_Carrera_S The springs are made from

The springs are made from premium steel and produced on Wafios coiling machines

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BC Racing BR Series Coilover - F3X 4-Series (12-18)

visually striking upgrade

lightweight polypropylene construction that maintains shape and integrity over time

AST Suspension Lowering Springs (50mm/30mm) - 2004-2010 BMW X3 3.0D (E83) YMM_2012_2016_Porsche_911_991_1_Carrera_Carrera_S The springs are made fromAST Lowering Springs for the 2004 2010 BMW X3 (E83) are manufactured from a premium high tensile chromium silicone wire which is handpicked by AST engineers for its quality and metal consistency. Each spring is cold wound and then heat treated to increase hardness and reduce internal stresses present after winding. Each spring is then individually shot peened, phosphate treated and then powder coated to outlast even the life of the vehicle. Features