AST Suspension Lowering Springs (30mm/30mm TUV) - 2003-2009 BMW Z4 Coupe 2.2/2.5/3.0 (Z85) 633 0L FWD (MK5) are the

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AST Suspension Lowering Springs (30mm/30mm TUV) - 2003-2009 BMW Z4 Coupe 2.2/2.5/3.0 (Z85) 633 0L FWD (MK5) are theAST Lowering Springs for the 2003 2009 BMW Z4 (Z85) 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