UMI Performance 70-81 GM F-Body Lowering Spring Front 2in LoweringUMIs 2nd Gen F Body lowering springs are wound from 5160 CrSi premium wire and feature a linear 600 lb in rate. UMIs front springs are stiffer than stock to provide increased performance with decreased body roll and a lower center of gravity. These springs are suitable for Auto x and Pro Tour applications as well as corner carving cruising. The ride height is engineered for a target 1 lowering with standard SBC as well as LS power (lightened cars may