so if you do the afc mod will you get more air in? or is it more fuel?

 

With the AFC mods it allows the Gov. arm to come forward more and produce more power. In my AFC the last limitation is the upper shaft that the foot "hooks" into. It bottoms-out against the front of the housing, this with AFC mods similar to the ones in 12Valve's photo gallery allows the foot to NOT be the Gov. arm stop as it sometimes is. After you do the AFC mods your plate will be your last limitation, so you can grind it way deeper and slide it farther forward by wallering-out the slots if you want. I think by that time the AFC and plate are as hardcore as they can get... With mine like that with a 4" downpipe connected to straight 5" and out a 5" stack, a free flowing intake and 38PSI of wastegated boost I leave a very thick stream of smoke behind me that never clears up and 1600* at 2600-2650RPM while still pulling VERY hard.