I saw the kit for sale indeed. A 1717 or 1527 would be monsters for this car!!
I'm looking into making a center diff in this Flux. The gearbox doesn't really add anything except for extra rotation mass, noise and wear (although this last one is not noticeable).
Mugen MBX6Te RCM + Mugen MBX6e RCM + Savage Flux XL FLM + MERV all with Spectrum DX3S || WTS&WTB