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      11-29-2012, 01:03 PM   #4
Mike Benvo
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Drives: Harrop SC M3 / E46 M3 / 7Turbo
Join Date: Apr 2008
Location: SoCal

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2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
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Originally Posted by HeartMD View Post
So I went out for a test run to better hear the sound. To better describe the sound, if i drive conservatively the sound does not happen but rather when I push the car somewhat ie: no particular RPM range. It happens when moving, and literally sounds more like the sound compressed air makes. as I get higher into the RPM range (>6.5k) the sounds goes away. It is not associated with any particular gear but Ive notice it happen from 3rd and up. It does not happen under load. I do have an Afe filter which possibly could explain the sound?
If the car is parked and I rev the engine high the sound does not happen.

A question for anyone!. If you were to have an exhaust leak would it usally be heard through all RPM ranges and at all speeds? Iam assuming that it would be heard if reving the engine while parked and not just while driving?
An exhaust leak is usually not a hissing sound. Usually when you have an exhaust leak you know it.

Maybe you can record a sound clip or video? My car w/ full Akra doesn't make any hissing sounds. Just roaring on a rampage sounds

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