From what i have heared the ninja engine's are made to mugen's spec's and the falcon are made to corono's specs and the boss is mario rossi's pirsonal line some one post some pics of the falcon crank and piston and liner and of the ninja crank piston and liner and pics of the boss crank piston and liner they are difrent engines by alot from what ive seen in paformance. Ive seen the boss off-road and ninja run side by side and the boss eats the ninja alive its better in every way Fuel eco power torque and rpm's. Regards Jeremy.