Super airflow converter vs. VTEC airflow converter
u wouldn't need a SAFC if ur setup isn't gonna be dyno tuned
same goes for VAFC, so if u don't drive a Honda VTEC don't get one
all it does is control VTEC high-low\low-high engaement points by modified pressure sensors and ECU readings
no gains really, the factory X-over point is adaquate unless u have some major mods and are planning a timing change\dyno tuning