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      12-10-2012, 11:53 AM   #2
E93Blackhawk
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Drives: 2008 335i M sport
Join Date: Oct 2011
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I think its 2.5" piping?

The e92 as far as I'm aware has no resonator.

Never really got under my car to have a look at the OEM setup, but as far as i can see, the primary cats are at the top, then you have a x pipe sort of, more piping then to the muffler.

http://www.e90post.com/forums/showthread.php?t=386902

Heres a guy selling his setup, but can someone advise me weather the pieces on the left are the primaries and in the middle are those the secondaries?

thanks guys.
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