TruHart Drag Spec Series coilovers are designed to increase off the line traction while allowing height adjustment with out sacrificing shock travel. Specially designed spring rates allows for a stiffer rear spring to allow you to put power down to the pavement quicker.
During normal launching conditions, weight is transfered from the front to the back. That instant transfer cause the rear springs to compress and spin the tires, desperately trying to get traction. The stiffer rear spring prevents that harsh compression for improved launch times and gets you going down the line quicker.