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.