ST Suspension 65429 Sport-tech Lowering Spring for BMW Z3 Coupe and Roadster, (Set of 4) Improve your ride with sport springs to lower the center of gravity, reduce body roll in corners, and limit weight transfer under acceleration Lowers the vehicle 1.0 inches - 1.5 inches; each application specifically engineered for optimal performance and comfort ST sport springs are manufactured to the highest quality standards ST sport springs are custom wound out of high-tensile steel, rigorously tested and inspected ST sport springs are powder-coated for durability