I have experience with both the SCT and the older Predator aka Pukator. While the Predator makes nice Power ( 100 hp mode) it is really hard on the head gaskets and the tranny ( due to no tranny tuning). My 1st and 2nd set of heads were a direct result of the Predator, as well as the tranny failure. As my signature states, I am now using the SCT with custom tunes. Don't even think about the canned tunes that the tuners come with, they do not even compare with custom tuning, but that is just my opinion. I only wish I could afford the "new" Spartan tuner.