Really I've heard it has closer to spartan power with out the rough shifting and less smoke than the hd and spartan tunes...sounds like I will be sticking with the hot damn tunes for now oh wellI ran it on stock Tranny and studs. Hate the tune. Wasted 250 bucks on it and Mike wont get back in touch with me which really pisses me off. Got a rough 2-3 shift and smokes like a freight train. My H&S hd300 doesn't smoke near as much and has loads more **** and get. Plus perfect shifts.