Jeff / 46,

I've got the EXI comb, head and tail that Oracus mentioned. It's on a Legend 450 and didn't require modifications. It may on a Belt CP.. If you can e-bay the tail you have, you'd be ahead of the game.. Being you'd have the head and tail, not just the tail. Until you get to where you can hover in all directions and do some basic flying, I wouldn't go crazy upgrading anything else. The CNC head and tail units, do help somewhat, however, it's you that control the heli, not the parts on the heli. It does take some time and a lot of patience.