Zephyr

Hey folks, got a weird issue that I'm not sure about.

2003 accord 4 cyl - auto

ever since I had my air filter replaced at one of those quick lube
places my car makes an extra humming noise.
its a vacuum sounding hum. Tracing it down more I know the sound is
coming from the air filter housing.

I opened the box while the engine was running, and the humming grew
noticeably louder.

nothing seems to be affected, gas millage is the same as before,
power seems the same, the only issue is this strange noise.

any ideas?


Dave