Just got a 2007 Hummer H3 and would like some ideas of what to do for performance/power......what works best. I have never owned one so its all new to me.

 

At the high end is a Mash Morors V8 conversion for about the price of another H3. At the lower end would be any combination of E-fan, PCM tune, header, ported throttle body. Somewhere in the middle would be a supercharger.