I have a 04 Screw 5.4 and I would like for it to have a simular sound to a GT mustang, any suggestions.

 

what ever muffler you get, get an x pipe

 

Yes definately get an x-pipe with true duals. On my 05 i have true duals with an x-pipe and no muffler. Its just striaght duals lightning style with an x-pipe, and i think it sounds similar to a Stang GT, only louder. Its really not all that loud! It sounds really good, its only loud as hell about about 2800 RPM. And on the 04's there are 4 cats, so that would quiten yours down a little more than mine, because my 05 just has two cats... So my reccomendation to you is to try the straights with the x-pipe lightning style out of some nice stainless tips! Oh and make sure to use 2 1/4" piping... You can always go back and put in a muffler, and if you decide to do that i reccomend the dynomax bullets! I have had 7 different exhaust setups, and have done alot of experimenting for power and the best sound, and what i have now is my favorite by far! Good luck on your new exhaust!