I just put my K&N Cold Air Intake put on this week and I heard a really high pitched squeaking sound coming from under the hood about 2 hours after installation. I went back the next day to the guy who put it on and after a couple of minutes of listening he found it was coming straight from the filter. Not to be confused with sound of air being sucked in, I know what that sounds like, this is something different. I hear it when I'm idleing or when I'm barely hitting the gas at 2000 RPM's. When I accelerate this noise goes away, I don't know why. The noise is considerably loud and can be heard from the inside of other cars with the windows up (I had a friend in another car see if he could hear it while in front of me at a stop light). I know plenty of you have K&N intakes and I was wondering if any of you have heard the same noise, or if it is normal. Thanks.