What is an AFC?

Air-fuel converter, an aftermarket tuning computer sold by A'PEXi. It is similar in some ways to the PMS and VPC but is generally considered less elaborate. The Super AFC was the basic toy to get but was removed from Apexi's website in 2006. As of 2015, AFC NEO is the new thing.

The original AFC is now known as the "knob-style" AFC. It had physical adjustment knobs on the front for 5 ranges. The "Super-AFC" uses a digital display and pushbuttons to alter settings in 8 RPM ranges, and has separate settings for high throttle and low throttle. The deprecated "Super-AFC II" is similar but adds more RPM ranges and other features to the devices.

Honestly, for the price, get ECMLINK. Lose the AFC route.