Actually, I have seen 15-20Hp gain with the turbo back system! Now, the GT is an older crowed. Uh, i mean a more experienced crowed so I dont think you guys will be into a mean sounding system. I think you guys would prefer a quiter one. Anyways here is a nice clip of what my system for the srt sounds like. THis is with a highflow cat as the only restriction. Straight trhough all the way back with no resonators or mufflers. ONly tips. I know the GT will sound simular with only one tailpipe but with less resonance which is good.
Sound clip of my srt setup.
http://www.bpustore.com/supra/exhaustdepot/srt3inch.wmv
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E.D. 3\" Turbo Back, , HKS SSBOV, GReddy-e01 Boost controller, Greddy E-manage fuel management, Blitz Turbo Timer, JE pistons, Ported Head, E.D. Large Frontmount Intercooler, E.D. Tubular manifold with t3/t4 (prototype), IPP coilovers, Limited Slip.
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