For unmatched ride quality for the street and strip, turn to QA1's Mustang II Pro Coil Shock Systems. With double adjustable, single adjustable, drag "R" series adjustable and non-adjustable valving options, along with four spring rate options, you will find the right coil-over conversion system for you. These shocks are designed to give you the lower ride height and "in the weeds" stance you're looking for, and they utilize a fully threaded body that allows you to adjust your ride height for the perfect stance or to finely tune the weight balance for superior handling. Used in drag racing, street performance, autocross, road racing and street rod applications. Each pro coil system includes (2) QA1 high performance shocks, (2) chrome plated, specially designed springs and all mounting hardware. Adjustable Mustang II Pro Coil Systems, Made in the U.S.A., Easy, Bolt-In Installation, Coil-Over, Ride Height Adjustable, Lightweight Aluminum, 100% Dyno Tested and Serialized, Rebuildable and Revalveable by the QA1 Factor or QA1 Authorized Service Centers, Sold in Pairs, , Steel Non-Adjustable Mustang II Pro Coil Systems, Easy, Bolt-In Installation, Coil-Over, Ride Height Adjustable, Polished and Chrome Plated Steel Shocks and Springs, 100% Dyno Tested and Serialized, Sold in Pairs.