Hyperco Front Composite Leaf Springs enable the serious Corvette owner to select the suspension performance level they desire for their Corvette. Front Springs The High Performance Street Series (HPS) provides improved cornering ability, road feel and initial response while maintaining a quiet and comfortable ride. The Street spring which is about 10% stiffer than the original C5 Z06 sping at about 565 lbs in front and 765 lbs in rear. Ride height adjusters, equipped with Delron pads, offer a wide range of tuning options. This enables the owner to set the look and handling of the car to their preference..mild to aggressive. Front Springs. Sold in Pairs.