hi I have an apexi air flow controller (old style with dial) and was wondering how far back can you reduce it without causing my r33 to run to lean. dial goes back 3,6,9,12,15%. I have a standard ecu and am running 12 psi. does anyone have one of these set up already and can give me an idea or do i have to put it on a dyno. I have been told that more power is gained by leaning it out a bit from the rich factory settings. thanks