Spanning more than four decades, Paxton Automotive has been setting supercharger standards. Complete and Tuner Supercharger Systems for the Mustang GT 4.6L are the ultimate bolt-on packages for on-demand street power. Complete System estimates show an increase of 170 HP for 2005-08 models and 183 HP for 2009-10 models. Tuner Systems do not include fuel upgrade (injectors, pump, ECM chip). Paxton carries a 3-year limited supercharger warranty.