Re: 16 and lookin to learn
Honestly, I like your current setup. Even though everyone seems to have flowmasters on their GT's, they still sound decent (but expect them to rust out eventually).
If you want to shy away from the flowmaster sound, you could swap in borlas or magnaflows as said above. Keep in mind they will be considerably louder than the flowmasters. Longtubes will deepen the tone and add a few hp's, but as big show 98 said they can be a pain to install, plus you need to make sure your piping corresponds with the length of the headers. You may have to do some custom fabbing if that h-pipe doesn't line up with the longtubes.
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.