I guess what I mean is I just dont see anyone selling the 5 pin ECU's around here as you just dont need it. It's always the 4 pin that the parts stores sell around here and of cousre the MP are all 4 pin. But since you can use the 4 pin ECU on any of the 4 or 5 pin wired cars it kinda makes sense to only sell the 4 pin ECU's. Ron