The Eibach Pro-Kit Lowering Spring Kit enhances BMW Z4 M40i handling with a lowered stance. Crafted from high-tensile steel, this set of four springs lowers the convertible by ~1.0 inch, improving cornering and aesthetics. Designed for Z4 M40i models, it offers progressive rates for a sporty ride. Installation requires compatible shocks and alignment. Powder-coated for durability, it includes a limited lifetime manufacturer warranty.