Hyperco Hypercoil coilover springs are trusted by top race teams and chassis manufacturers who insist on using the best quality products available. Each Hypercoil spring is built to deliver the best in performance—by utilizing cutting-edge design concepts like Optimum Body Diameter. OBD adjusts the body diameter of the spring relative to the end coils to provide more deflection and help resist bowing. This design achieves a consistent spring rate and better performance, giving you the edge that you want. It doesn’t matter if you’re running Circle Track, dragstrip, off-road racing, or just setting up your own street machine, you can’t go wrong with Hypercoils.