I run the MMP in my 511. It just fits although obscures the slipper clutch adjustment with a socket spanner, so I grip it with mini pliers and set it that way.
I also run it with a BLS451 servo - pretty big servo there is room, if you're happy to compromise the slipper adjustment.
I've not had any issues running it for this season - it's bullet-proof and fits well under the body including fan.
I'll take a pic and post it tomorrow.
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