VAFC is to control air/fuel and vtec engagement. SAFC just does the air/ fuel adjustments. If you did buy it you got something that is made for hondas. Anyway if your not looking for over 300 then a SAFC 2 is probabally what you'd want.

I've got a Apexi Power Fc and I love it. plugged right in and its like having 8 gauges in one. Not to mention it can do whatever I throw at it.