The QA1 GM Coil-Over Shock is a great option for anyone looking for fully adjustable ride height and valving control. Choose a from double, single, Drag "R" Series or non adjustable valving to fit your driving style and you are on your way. This system is a great option for anyone looking for a suspension upgrade for their street car. Adjustable Coil-Over Shock Features: Aluminum Made in the U.S.A. Easy, Bolt-In Installation Coil-Over Ride Height Adjustable 100% Dyno Tested and Serialized Rebuildable and Revalveable by QA1 Authorized Service Centers Non-Adjustable Coil-Over Shock Features: Steel, Stock Appearing Shocks with Silver Powder Coated Springs Easy, Bolt-In Installation Coil-Over Ride Height Adjustable