My friend brought a 94 Gt a couple of months ago. He has installed a 347 w/supercharger ( S-trim ) along with long tube headers,H-pipe and Spintech prostreet mufflers w/turn downs. When he drives the car it sounds like he is running open headers ( sounds like crap). He has not taken his car to get tuned ( running the stock computer ) and I say once he gets it tuned and a custom chip burned for it, the car will run alot better and the exhaust will sound alot better. What do you guys think? My friend thinks even with a tune the car will still sound like crap. He wants to put Flowmasters on before he gets it tuned. I told him to wait until after the tune, then if he still thinks the car sounds crappy then he could put the flowmasters on. All input will be greatly appreciated. Thanks 
