When I rev it or punch it on the road I do have the "whoosh" sound from my intake, however, every time I turn the key off and shut the engine off I have this sound that is like an AC compressor shutting down. It happens right when the engine is on its last cycle and is in unison with the engine shutting off. The sound comes (I think?) from the engine bay right in front of me on the drivers side. Power steering pump?. Just started to make this sound, and I don't like it. Anyone have an idea. Thanks

 

It's most likely your K&N FIPK. Why it just started, I can't tell you since my CAIs always did that.

If you're still unsure, have a friend listen to it while you're turning off the engine.