ARS tensioners are engineered specifically for serious racing enthusiasts. If you have supercharger you need an ARS tensioner, its the strongest way to eliminate belt slippage. Direct bolt on replacement for your stock tensioner. Increase boost and HP by reducing or completely eliminating belt slip. Applications include Hemi, COPO, Ford or GM. Anyone that is racing a supercharged muscle car knows that the stock belt tensioner was not designed to stand up the stress and the strain of racing with increased HP and torque. Designed and fabricated from 6061-T6 Billet Aluminum (not cast) and no adaptor plates or accessories required for a simple installation. ARS Tensioners have been proven on the DYNO and the Race Track and will. As a result of our engineering and the use of custom fabricated springs, hardened steel shafts, needle bearings and bushings the ARS tensioners will outperform anything on the market. No more broken, shredded or melted belts. We are so confident that our tensioners will not break or bend, that we guarantee them for the life of your car. Team Beefcake Racing is an Authorized Dealer for American Racing Solutions, call 1-855-827-7223 for more info.