Thread: ISF Exhaust?
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      05-05-2012, 12:38 PM   #1
Drives: e70 X5 4.8i (Temporarily)
Join Date: Dec 2011
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ISF Exhaust?

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.
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