Just installed the Dynaudio System 240GT into my GTO and it sounds fantastic. It fits easily into the stock locations with very little modifications. Also used MW190 subs in back. These are not pounders or ear bleeders, but for those of you who want a system that plays every type of music (i.e. CSNY and Godsmack) at extreme high fidelity but don't want to cut up their GTO doing it, I would definitely recommend them.