AST Suspension Lowering Springs (30mm/15mm TUV) - 2006-2013 BMW 3 Series 318i Cabrio (E93) 135is The ST X Coilover Suspension

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AST Suspension Lowering Springs (30mm/15mm TUV) - 2006-2013 BMW 3 Series 318i Cabrio (E93) 135is The ST X Coilover SuspensionAST Lowering Springs for the 2006 2013 BMW 3 Series (E93) 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.