if your going to buy an afc, then take ur cvar to the dyno so they can maximize the power output. but honestlky, there not worth the money unless u have some heavy head work and some internals done. first, go and tune it, tinkering with the cam, ignition timing and also mess with ur FPR. if ythe tuner sasy u can benefit from getting deeper into tuning, then go for it. other wise its just bling.
if u plan on sticking NA, put that money towards ITBs, then u could make use of that afc/ good luck