Tein SKS66-AUB00 S.Tech Lowering Spring for Subaru Impreza Front spring rate: 4.5 kilogram per millimeter (252 pounds per inch) Rear spring rate: 3.9 kilogram per millimeter (219 pounds per inch) Front ride height: -42 millimeter (-1.7 inch) Rear ride height: -33 millimeter (-1.3 inch) Progressive spring rate design