My 2007 Mustang GT, After all my other mustangs, I wanted to get back to the V8 monster and try a different approach. I bought the 2007 GT at the end of 06, as a factory GT premium. After having it a few months and hating the senior mufflers I opted for SLP loudmouths, which I hold as the best sounding exhaust I have heard on the modern mustangs, they are not muffled, they utilize a mandral bent pipe system to tune the exhaust. I also added the retro center mount headlight grille, and the K&N Aircharger which has the highest HP gains but was not Cal DOT smog passable. Fantastic sound and performance!!!!