RCM muggy mount question.

[lincpimp]

Does anyone know how small of a pinion can be used with the muggy mount with a 39mm diamter motor (hacker c50 xl)?

Just wondering as a 13-14t pinion would be perfect for what I want to do. I have a feeling it will fit, as I got down to a 12t with no issues with Mike's hyper mount and the same motor, but I want to make sure...

Also could I put a kyosho spur on the muggy center diff? Not sure if I will, just want to know if I can.... This thing is heavy, so a steel spur is most likely mandatory...