Thread: HFC or X-pipe
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      04-16-2010, 11:08 AM   #13
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Quote:
Originally Posted by J08M3 View Post
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.
+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.
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2011 B8 S4 S-Tronic , Black on magma red