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      06-11-2009, 04:03 PM   #5
Major General
J08M3's Avatar

Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

iTrader: (8)

Unbolt flanges from headers, and resonators from connecting pipes, and center hanger from transmission. Exhaust will then drop down. Center hanger from transmission is not used on new pipe. It's not necessary without secondary cats.

Take out O2 sensors and put them in new HFC section
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Close up of Secondary Cat Delete
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make sure to take this mount of X section and bolt it onto new pipe in same location before installing. Slide the X-pipe and HFC sections together but don't tighten yet.
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Last edited by J08M3; 06-11-2009 at 04:36 PM.