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Check out the Boom tubes. They are loud and a bit deeper than the SLP's.
i was just going to suggest these...i myself am going back and forward trying to decide if i want the boom tubes or the loudmouths...my friend wants me to get the loudmouths cuz he says they r the loudest, but i like the sound of both and i'm pretty sure on a GT they will both be loud
Go to Brenspeed.com then videos top link and they have a wide selection of sound & video clips.
I hope this helps PYPES has sound files and Magnaflow as well.