Alright yes I know, this's been discussed many times before, but this is a bit of venting for me. Nonetheless, my stupid solution works.

The farthest air filter housing rubber buffer from the engine absorbs the bulk of the vibration. In other words, out of the three housing buffers, the one closest to the passenger side moves the most. In other other words, that buffer has the greatest range of motion along the y axis.

So instead of using a rubber buffer there, I just use a folded paper towel...folded over again and again until it's a neat square that's approximately 125% of the height of a rubber buffer. That son of a ***** absorbs practically all excess virbrations and renders the air filter housing practically silent. The mass of the housing is enough to hold the folded paper towel in place, even at highway speeds.

I used my hillbilly method for a year or so, but didn't like that it wasn't "proper". So I bought 3 new housing buffets/mounts. Installed em with 2 m6 hex nuts per buffer. Started up the car... housing sounded like a machine gun.

Yeah, my motor mounts are probably shot. But still, paper towel method... it works regardless. Ugh I spent all that time installing new crap and my stupid paper towel fix worked better.