Hi i just installed a K&N Air Intake for my 2006 Audi A3 2.0T Quattro.

Picture after installation: http://i42.tinypic.com/2yopqwj.jpg

I had already mapped my car to 242bhp, and have a Remus Power Sound exhaust installed.

Today after the install of the Air Intake my engine makes a strange sound at 4k RPM. Above it its fine, below it its fine. You can hear the sound on the youtube video.

http://www.youtube.com/watch?v=iqUdaXQ6dno

I can not find any leaks in the pipes or connections.

Any idea what this might be? The car drives fine, and performs well as far as I can tell.

Thank you for your time.