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      09-11-2012, 07:29 PM   #7
JYohay
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Drives: 2011 X5
Join Date: Mar 2012
Location: NY

Posts: 2,011
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What I am saying is that when the valves side is closed, the air passes through that pipe to the other sides muffler.
If you cut that off the only place the drivers side exhaust gas can go is through the H pipe in the midpipe, which I do not believe is enough volume to properly allow for the exhaust to get out.
Youd be constricting it when the valve is closed.
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