I have the SMS challenger 2010 6spd Supercharger and like it's been said you can drive normal with it with some winding noise form it, but when I go WOT the car just goes wild unable to keep it on the road with good street tires. This week end was Dyno Day and the SMS a 5.7L pulled a 475hp @ rear wheels @ 470 tq. 7# boost. and there was more to go but @ around 5800 rpm it rev.limits. The 5.7L is a 370Hp @ crank. Back in the 60's it was a 1,000 dollars for every sec. faster. Today it cost's a lot more.