Here are some pics of my newly converted Mugen MBX5T Prospec. I bought it used from someone on another forum. It was filthy with nitro crud when I got it, so I spent several days cleaning it and replacing worn out parts.
The truggy has the following brushless equipment:
Mamba Max (with fan and two 330uF caps added)
Mega ACn 20/45/1E motor (2100kV)
Polyquest 25C 4S 5000mah lipo
RCM motor mount
RCM battery mount
The only noteworthy thing about the conversion is the old-style TMaxx receiver box that I used. It has the Spektrum receiver and CCBEC stuffed in it, which cleans up the wiring nicely.
I've run through one pack so far, and everything works well, but I was surprised how loud the steel spur is. My gearing right now is 46/18, btw, which should be good for about 40mph.
The motor got pretty hot, so I'll probably order an RCM motor heatsink soon. Also, I'm going to make an aluminum center diff top plate to secure the MM better.