The V-AFC (VTEC-Air Fuel Controller) is a version of the Apex'i S-AFC (Super-Air Fuel Controller) that is preset for a Honda speed-density fuel system and has an extra built in VTEC controller. It is basically a piggy-back fuel computer, the VTEC controller is just an added bonus. It's useful, but must be tuned with a wideband O2 sensor (typically on a dyno.)

A cheaper alternative is the HKS S-AFR. I have one coming to me in the mail.