Your buggy looks AWSOME :027: . How did you get the kyosho 46t plastic spur to fit ?. I was told it would not fit the mugen center diff.
You're right, the Mugen diff won't work with the Kyosho spur.
Mike made a custom diff mount that uses the Hot Bodies center diff.
It works great and mounts in the original diff mounting holes, so the chassis didn't need to be altered at all.
PS, the only thing I would alter in that setup is the motor mounted high like that... it really puts the center of gravity much higher. The motor is about a pound, much heavier than the head on a nitro. I think you will find the buggy leans a lot in corner and if it doesnt, you're losing on traction by compensating with heavier springs.