I'm trying to figure out what to do, if anything, to my new to me 05. My Ford Dealer is also a Roush Dealer and said they can supercharge my V6 to give it as much power as a GT. Cost is 6700. Why would one want to do that vs putting that money toward a GT? Would the souped up 6 get better mileage than the V8? Lower insurance? I'm sorry, I don't understand that if someone wants that much more power why not just get the GT?