Last night I took off the air filter and took a test drive without it. What I noticed was way better torque and acceleration, and pretty mighty vacuum sounds =). I know I know, one should not drive without the filter but just had to try.
A thought came to my mind: "Why not design cabinet for filter of your own choosing?"
The freeflow filters are very expensive when bought separately, like 100$ a piece. And you have ot buy 6 of these. Different case, and there is only need for one bigger freeflow filter.
Here's what came up, tell me what you think. Planning to build it from stainless steel.
//Zen