So I have a 2006 G6 GT, 3500 engine and what not.. It only has single exit exhaust and I hate it. So I'm looking into exhaust and it dawned on me that i could potentially just go to a junk yard or on craigslist and pick up the exhaust and rear bumper off of a GXP and that would save me a ton of money. Now I know that there engines are pretty much identical other than the displacement, so I'm pretty sure externally they are the same. Would this work? Would it mount up correctly and would I have any issues fitting it under the car?