Quote:
Originally Posted by J08M3
well on OEM it does since it's all one piece, but not on the aftermarket systems. Most of the aftermarket x-pipe have you either take off the primary cats, or they have you cut the exhaust behind them and bolt on to them.
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+1
Although I think it depends on which aftermarket. AA is 2 pieces so you can go catless or HFC or
CUT your stock pipe after the primary cats.