MEFI 5. I'm only interested in doing one boat for a friend. I was hoping not have to spend the big cash on the software. (I know... B.O.A.T. means "bust out another thousand"). I have TunerPro, Efilive, TunerCat OBD 1 & 2 with a RoadRunner, Moates stuff and several others. I don't really need another.