Used a vafc2 in a 2000 Nissan Sentra se with a sr20. Added turbo, bigger injectors, used a Nissan maf from a 300z twin turbo. Runs pretty decent and is fast. Safc only has 12 points of correction. Vafc has 24, 12 in low cam and 12 in high cam. It can only get you so far as it only alters the load sensor input to the ecu based on throttle pressure and rpm allowing fuel to be removed. Does not change timing at all.