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I would think that, if there WAS a difference, that it would require different midpipes, not the H-pipe.
Nuke you are correct. I did some more research and found that any exhaust shop can modify the GT500 muffler inlets and it can be used on an 05-09 GT. Apparently the new GT500 uses a ball and socket type inlet instead of the 05-09 slip on type.