you need high flow headers, O/R H or X pipe high flow cats nice sets of mufflers like macs (and the like) and some 3 inch tips then you sounds good not no crap GT catback setup
i got teh catbaxorz!? but that because i plan on getting teh hi-fl0 c47s, latr on when i haves sum $$$ X_X
oh well, it still sounds better than some GTs even without a new X pipe or w/e! lol =P