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      12-20-2012, 04:29 PM   #7
HBWT
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Drives: 2013 X1X 2.8
Join Date: Oct 2012
Location: Va

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Easiest way to do it is the stick a BB into the hose and then re-attach the hose. I haven't done it on my X1 but I did it on my 335i and the sound diff at idle/low RPM was quite pleasing.
The mod simply makes it deeper and ever so slightly louder...not to the point of being annoying though...inside OR outside the vehicle
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