AST Suspension Lowering Springs (30mm/30mm) - 2003-2010 BMW 5 Series 540i/550i Sedan (E60) kw-suspension-variant-3-coilover-kit 1inch) Spring Rate - Front

1inch) Spring Rate - Front 18

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AST Suspension Lowering Springs (30mm/30mm) - 2003-2010 BMW 5 Series 540i/550i Sedan (E60) kw-suspension-variant-3-coilover-kit 1inch) Spring Rate - FrontAST Lowering Springs for the 2003 2010 BMW 5 Series (E60) 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.