AST Suspension Lowering Springs (40mm/30mm TUV) - 2001-2004 BMW 3 Series 4CYL Compact (E46) Highlander 1997 Mazda MX-6 M Edition

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AST Suspension Lowering Springs (40mm/30mm TUV) - 2001-2004 BMW 3 Series 4CYL Compact (E46) Highlander 1997 Mazda MX-6 M EditionAST Lowering Springs for the 2001 2004 BMW 3 Series (E46) 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.