Exhaust options with warranty

[05RedGT]

I've got a 05 GT that is under warranty and I was wondering what my options are with putting a aftermarket exhaust on my ride? Can any of u 5 star guys give options. BTW I got my GT from 5 star ford in carrollton

[5starstanger]

I've got a 05 GT that is under warranty and I was wondering what my options are with putting a aftermarket exhaust on my ride? Can any of u 5 star guys give options. BTW I got my GT from 5 star ford in carrollton
It needs to pass emissions. A cat back system is perfectly fine and very common.
I'll PM the other route. :D :D

[joezgarage]

FWIW, we have done some exhaust work on my friend's 05 GT. We started with a cat back and it changed the sound quite a bit. Looked better as well. He then went and bought Bassani's high flow x pipe (with the cat delete option). We installed it without the cats first, and it was terrible. It didn't throw any codes, but it was god awful loud. The sound from these new ones without cats just isn't like the old 5.0's. It sounded like some wounded truck with open exhaust. We had to take it back off and install the high flow cats. It toned it down to reasonable levels and gave him a little HP boost to boot.