Hummm, ball diffs will be a good option for sport and touring racing. As for the one way diff, errr, perhaps if I will enter an electric touring races again, a one-way diff would be an advantage. My Yokomo MR4TC have a one way diff in it and it ran great on technical courses.

I raised an inquiry about the use of silicone diff oil to this kit because, I have 2 Ofna 1/8 scale buggies and all their diffs are filled with silicone diff oil. My Nitro RS4 3SS diffs are likewise filled with silicone diff oil so I don't have to use the diff tuning spring also from HPI.

I'll do another search of its diagram and perhaps see if it is possible to seal the diffs.