For Ford Mustang 3rd & 4th Gen Pony SN95 Suspension Racing Lowering Spring (Black) Improves Handling, Responses and Balance / Lowers the Center of Gravity to Improve Performance and Increases Stability Reduces Squat during Acceleration, Body Roll at Corners and Excessive Nose-Dive under Braking Compatible with OEM Shocks / Direct Bolt-On Replacement for the Stock Unit Lowering Rate: Front - 1.5" and Rear - 1.25" Spring Rate: Front - 450 lbs/in and Rear - 250 lbs/in