I have not noticed this before, but recently I installed a JWT Popcharger with Z-Tube, at idle, and when I put my ear near the Popcharger, I can hear a metallic "ringing" noise, I checked the filter to see if its hitting anything and its clear, can you guys check too see if yours doing this also? Help is appreciated. Does the stock intake do this also?

 

By the way, could it be just that the engine is making this noise and its resonating at the end of the filter, or could it be something else, I am kind of worried.