you're worried about putting headers on, but you're confident about putting on a turbo?? i don't think you understand how much is involved with a turbo...on the 07 i would have to pull the engine to do headers
and just out of curiosity do you know what kind of turbo or supercharger would work because some people say a turbo on a g6 is unsuccessful
I'm not trying to burst your bubble here, but there is a LOT involved with a turbo and if you aren't very knowledgeable about engines/cars, then I'd suggest that you stay away from a turbo until you are knowledgeable about engines to the point where you can do it all yourself (except the dyno tune...cuz who has one just laying around?)
unless someone actually gets a turbo setup on a G6, then we're all going to assume that it "isn't worth the money"...which IMO isn't true, but I'm not about to dump that much money into my car because : 1. mine's automatic 2. i'll probably be buying a newer/different car within 5 years 3. i don't have anywhere near the money that it'll cost and 4. my G6 is my DD and it gets crappy city mileage to begin with