Coil-Rite™ air helpers springs mount inside an existing open coil spring suspension. These air springs provide adjustable spring rates far superior to the standard coil spring. The durable polyurethane air springs will support 500-1,000 lbs.
Not the easiest to install. My car has reduced diameter coils at both ends of the spring. Easier to remove the spring, stuff the bag in on my work bench, reinstall the spring. At max pressure there was a 2 inch gap from bag ends to the perches. A 10 mile drive allowed the bag and slip-fit in the coil, now just 1/2 inch gap with no cargo, preserving ride quality. Will reduce pressure for unloaded use after overnight leak test confirmation.