Take your 1963-76 Dodge/Plymouth A Body or 1970-74 Dodge Challenger to the pinnacle of performance for autocross and track days. Hotchkis-Tuned Adjustable Performance Series Shocks are one of the fastest, easiest and most dramatic modifications you can make to a Mopar, dramatically improving grip, steering response and control. Adjustable Performance Series Shock Absorbers are manufactured by Fox and tuned by Hotchkis engineers to be the ultimate single adjustable shock for of your muscle car. Engineered using the most advanced development tools available, the valving of these shocks was fine-tuned to deliver a smooth, comfortable ride on the shock?s softest setting and a more aggressive, race-oriented ride on its stiffest setting. Developed as part of a balanced system, Hotchkis-Tuned APS Shocks give your vehicle more control and balanced handling, especially when installed in conjunction with a Hotchkis Total Vehicle System. These shocks are made in the USA and are built with heavy duty billet aluminum end caps, polyurethane bushings, and ?? hard chrome plated, heat treated alloy shafts, ensuring years of trouble free operation.