So a little bit back I posted with temp issues, and redid my box. I'm happy to say the temp issues are now solved but now I have sound issues. Here's a diagram of my setup: The red lines are sealed air tight, the yellow line represents the side of the box where I drilled roughly 286 3/16 (slightly smaller then a pencil) holes in the side. I now hear the sound of moving air. I was wondering if that could be caused by the air being forced through these small holes? I wasn't sure if its the air being pushed through the holes or just the air coming out of the filter. When I stick my head on the red line side of the filter box I hear nothing which is leading me to believe the small holes are the source of sound. I wanted to keep them small so that if anyone were to look at the holes the couldn't see inside and the filter but sound is no good either and if anything just draws attention to the box. Anyone have any ideas on how to correct this and still maintain stealth?