Thread: ISF Exhaust?
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      05-05-2012, 10:55 PM   #4

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Drives: 2011 BMW M3
Join Date: Mar 2012
Location: Denver CO

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Originally Posted by lthai
So I was able to test drive a stock ISF today and I noticed that once the car was moving at around 65-75 MPH the exhaust note changes and gets really deep and loud to point where I could feel it in my ears. I'm just wondering what makes this happen and I could get a similar effect with an M3.
That and the pipes in
The back are fake ....