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The 08 doesn't have a front resonator. Mine just has a straight 3" pipe between the muffler and front Y-pipe.
Look into a bolt-on Magnaflow #16700 cat-back. It comes with the straight midpipe from the Y back to the muffler like in my picture, then dual 2.5" tailpipes. It's all bolt-on.
To be honest, my 08 stock set-up flows pretty good. Not as good as the Magnaflow, but pretty good for stock by watching the condensation smoke in cold weather. It is quiet though.
well i yanked all that mess off yesterday and installed the dynomax 19428 catback (amazon 280$)
it has the ultra flow ss muffler. super easy install, and clean. sounds great.