AST Suspension Lowering Springs (35mm/25mm TUV) - 2006-2013 BMW 3 Series 330i/335i/325D Coupe (E90/E92) 500X Part Number W63391 Part Name

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AST Suspension Lowering Springs (35mm/25mm TUV) - 2006-2013 BMW 3 Series 330i/335i/325D Coupe (E90/E92) 500X Part Number W63391 Part NameAST Lowering Springs for the 2006 2013 BMW 3 Series (E90 E92) 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.