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      06-08-2007, 01:58 AM   #3
Mikes12985
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Drives: Black on Black 335i Coupe
Join Date: Apr 2007
Location: S. FL

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Quote:
Originally Posted by IS2000 View Post
I'm just wondering if it's normal for the N54 to be making high-pitch sound at 4K rpm and above? The sound is pretty noticeable inside the cabin.
this shouldnt happen unless u have AA Xede or Procede. I have the Xede and u can hear a pshhhht in the high rpms due to more boost and also i can hear the turbos spool up harder and louder. Mike.
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