My car has a supercharger and - was wondering if 4.10 gears are a good idea? I pretty much just want them for "fun factor" and basically just drive around town and do some highway driving. Almost all I hear is they are great with naturally aspirated, but wanted to know if they are OK with a supercharged motor. How many RPM's at 55, 70, 90 MPH? I have a 5 speed with short-throw shifter and upgraded performance clutch.