I'm looking at building up a mountain/boon docking sled using a 04 snopro race chassis, an extended track and dropping in a stock 700 EFI motor. I'm just curious as to whether there is a difference between the F7, M7, sabrecat700 or crossfire 700 motors. Is there different programing to the ECU's. or any physical differences? I plan on using the sled in michigan's UP so it won't be too high elevation, but I will probably take it out west a few times a year. Any recommendations/ ideas?