2004 GTO

Stock vs Random Tech cats and 2.5" midpipes

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Note the flattened section in the back of the stockers and all the bends.




Note how much smaller the inlet to the stock cat is compared to the full size RT piece.
That's 2.5" for the new stuff, ~1.5" for the old junk.

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Sounds:
Stock Exhaust
Exhaust with RT cats and midpipes (stock cat-back and manifolds)

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