I was at Barnes & Noble on my lunch break and looked at the current Pontiac Performance magazine. They have the 2nd half of a supercharger installation on an 04 GTO and the dyno results before and after. Looked like the Procharger setup. 444 HP at the wheels, and with the driveline loss there was over 500 HP at the crank. 50% throttle gets the tires smoking. :cool