A saito 150 - 180 is way enough power for the GB suhkoi we have several around here 91 four strokes to 180 saito, they will do any thing you want. that BGX is dangerously over powered. GB never engineered that airframe to accept that sort of shockload or torque stresses it will be a short lived airplane(my opinion of course). one must remember that an aerobatic plane was meant to fly in a small box in front of a group of judges or a crowd they were never meant to be speed racers conversly the racers were never meant to do any thing but go fast turn left