why engine management u don't have enough mods to warrent the need for an engine management system, if all u have is an intake and exhaust. on my gsr, i have cams, adj cam gears, skunk2 intake, comptech headers and ice box, and apex n1 exhuast and all i am running is a VAFC 2 and my car runs great but i also have a lot of stuff done to the car that warrent the need for it