AST Suspension Lowering Springs (35mm/35mm TUV) - 1997-2004 BMW 5 Series 540i Touring w/ Air Suspension HA (E39) Colorado Optimize Rear Suspension Geometry on

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AST Suspension Lowering Springs (35mm/35mm TUV) - 1997-2004 BMW 5 Series 540i Touring w/ Air Suspension HA (E39) Colorado Optimize Rear Suspension Geometry onAST Lowering Springs for the 1997 2004 BMW 5 Series (E39) 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.