Hello everyone, hope all are well. I have been able to keep my mustang well maintenanced and so I hadn't been on asking for help for quite some time, until now. I have been having some howling noises coming from the air filter box. This is a K&N Filter in the factory box into the fender. The howling noise which can be heard a block away or so is only active inbetween 1k and 2k rpm's and generally only when little or no throttle. Originally I would only hear it while driving but it has progressively gotten worse and now will howl in park. I did a google search and found this issue abundant within the Ford SUV's forums, and most of them mention replacing the IAC valve. I wouldn't have thought this as the problem. I took the box/filter apart and found that the rubber seal on the K&N filter was loose, not fully attached. I figure this is the problem, but before I replace it I thought I would take a shot on here and see what the "pros" thought. Thoughts? Thank you.