well of course the simple answer is go with stand alone but my budget doesnt quite fit that at this point. right now i am planning on running a 4agze ecu with an apexi SAFC. i already have gze injectors fuel pump, aem fuel pressure regulator and vortec FMU for fuel. i am only planning on running low boost so what do you guys think of the safc? do you know any other piggyback systems that would be on the same lines of the safc? thanks!