Before you assume that it is definatley the CAI you should take a second listen or replace your CAi with the stock Air intake.

I am breathing thru stock and I stil have a bit of whistle...and it is subtle as hell...but once you notice it you cant ignore it. Its not the T/B and its not a belt.

Iv'e posted a few times about this..but havent isolated it quite yet.

The car is going to the stealership (still under warranty) to rule out any bearing ish. In the mean time, cut a length of rubber hose and hold one end to your ear and one end at the PCV valve. If that whistles swithch it. Rule that out first ($16.00).

Ill tell you what they tell me.

Dev