Why not try a +3 stock 700 throttle body or a WK 54 maybe an old 52 with a 550+ injector(I dont know what the required flow would be with a 2 stroke), machine a manifold, rig an intake sensor in the intake tube, out smart a raptor ECU and put a PC5 on it? Is this a viable brainstorm? I think the craziest thing is out smarting the ECU but the PC5 allows for so much more fuel adjustment and without an intake sensor youd still have to adjust all the time for elevation and temp. A raptor fuel pump might actually fit in a banshee tank and if not there is still the pump from a 450r/x. Why make a TB when you can just buy one? A TB is a TB, flow performance will be in the intake manifold. Anyway I hope you get this done I think it would be cool, but there is a reason why 2 stroke ATVs sont have EFI......it's a kind of a pain in the ass to do; at least it seems that way.