Thread: Update
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      11-22-2012, 09:15 PM   #17
turbodreams954
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Drives: 2007 SG E90 335i
Join Date: May 2012
Location: United States

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Quote:
Originally Posted by E90Company View Post
Are they/have they ever made the siren/howl sound?
Not that I recall. Still make power fine and hold boost fine. Just smokey at idle and coming to a stop.