Tein VSSB0-C1SS4 Flex Z Coilover Kit for Subaru WRX / STI Front - Ride Height Adjustment: -30mm/Spring Rate: 8 kg/mm (448 lbs./in) Rear - Ride Height Adjustment: -25mm/Spring Rate: 7 kg/mm (392 lbs./in) 16-level Linear Damping Force Adjustment System Ride height adjustable shock absorber Highly-Rigid Bracket & Shell Case