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.