the y7 tb/iacv will only work w/ the y7 non-vtec ecu or y8 auto ecu. if you're going to use the y8 5 speed ecu or a socketed/chipped ecu w/ obd2-1 conversion harness, then you'll need to do the 2 wire iacv conversion and use the one on the back of the manifold and ditch the y7 tb for a non 3 wire iacv tb.