AST Suspension Lowering Springs (30mm/30mm TUV) - 1990-1993 BMW 4 Series 418i Gran Coupe (E30) 640i Part Number W21169 Part Name

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AST Suspension Lowering Springs (30mm/30mm TUV) - 1990-1993 BMW 4 Series 418i Gran Coupe (E30) 640i Part Number W21169 Part NameAST Lowering Springs for the 1990 1993 BMW 4 Series (E30) 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.