Hey I've got a similar question. I have a 03 GT completly stock. Im looking to upgrade the exaust but i dont know too much about it. I've been asking around lately and the people at ford tell me that they'll upgrade my exaust to flowmasters for about $500. That seems a little steep to me because it hardly cost me $300 for flowmasters for my firebird. Then again it wasnt a true duel. I love the rumbeling sound and want to get the best for my money so would i be better off with the SLP loud mouth or the flowmasters? Also i deffenetly want cats. They keep backpressure right? When i would rev up my firebird in neutral it would get all gargally when it hit 3 and wouldnt go past it. I dont know if it was because of the new exaut or because i beat the crap out of it. I deffenetly want my mustang to rev up all the way to redline just as smooth as it does now though, expecially since its a 5-speed. Also, an x-pipe? what exactly does it do? Does it make the v8 sound more fierce? Is it good for horsepower? is it expensive and does it require a certian exaust? Thanks for any Helpful imput. P.S. The louder the better for the exaust as long as it doesnt shatter glass or anything. ( even though that would be fun )
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