The Schelle Nova slipper works great on my Centro C4.2 and I lived it better than the V2 slipper... plus it has a much better tuning window for slip and weighs a bit less to close to 1 gram over the standard v2 two pad slipper
Now as for the gear diff in the original XM.. the TA06( TRF201 ) gear diff is too wide and will not work.. but with a little bit of work you can get a Kyosho one to work
