AST Suspension Lowering Springs (50mm/40mm TUV) - 1999-2005 BMW 3 Series 330D Touring (E46) Pony A critical service item to

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AST Suspension Lowering Springs (50mm/40mm TUV) - 1999-2005 BMW 3 Series 330D Touring (E46) Pony A critical service item toAST Lowering Springs for the 1999 2005 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.