Procomp Electronics has put together these coil-over shock and spring value packs to help you replace your OEM rear suspension and help your race car be more consistent on starting line launches. They include a pair of adjustable coil-over shocks, and a pair of silver powdercoated coil-over springs. The Procomp Electronics coil-over shock and spring are available with a variety of spring rates that you can match to the specific rear weight of your vehicle. Stop wasting precious time on the starting line--pick up one of these Procomp Electronics coil-over shock Assemblies and outrun your competition.