Use it.
SAFC or VAFC they both work with 4E and 5E series, you can easily control fueling on any desired RPM you want. very easy to use and install..
VAFC, have one extra wire to trigger Vtec, which can be used to trigger any option at any RPM you want, like shift light, water injection etc etc. VAFC only work with MAP based ecu.
SAFC, work on both MAF and MAP.