Every spring is computer tested as the last step?every spring, not just a sample from each batch. Each spring is loaded in the spring tester at the factory, then compressed and the CNC load cell measures the force for a variety of spring lengths. This allows BMR to offer a LIFETIME WARRANTY against spring sag.Blending aesthetics and performance, BMR has designed the SP463 for the street performance crowd who want to use their cars in a variety of application. These springs will drop the front end of your V-8-equipped 1978-1987 G-Body 2-inches in both the front and the rear. These springs feature a fine-tuned spring rate to give you great handling and a smooth ride. The honed in spring rate offers plenty of support, keeping the body flat and level in the corners, while remaining soft enough for a comfortable ride on any road. When performance and looks are a must, rely on BMR's suspension!BMR's suspensions SP463 lowering springs are available in red powdercoat for long-lasting good looks. Installation time is about 2-3 hours. Proudly made in the U.S.A.