Coil Spring Assisters by AUTORUNNERS are necessary because most standard car springs are designed for comfort of the passengers and are not strong enough for bad roads and heavy weights carried in the boot, so decreasing the possibility of shock absorber from bottoming and reducing stress on the Bushing. Coil Spring Assisters doubles the life of your Shock Absorber and Bushing, Increasing Handling and reducing road noise so giving the ability to drive on Indian roads stress free and reducing cost on maintenance.