My friend has a 3.3 in his rustler and he had to get steel spur gears because the plastic ones stripped to easily.He also had to get a wheelie bar because the engine had so much power. That car flys down the road at like 65 mph!! One time the radio frequency was lost and the car took off. My friend hit a car tire at like 50 mph and it broke the suspension arm,the shock,the shock tower,and the turnbuckle. The 3.3 in the rustler really isnt a good choice you should get like an os .16 or somethin like that.