It's worth pulling the diff apart IMO to see if it is just the ring and pinion that's damaged and not the torsen (I think?) LSD. If that's the case, an alternative could be to source an early RX8 diff and swap them over. They're super cheap at usually in reasonable condition from what I've found. Plus it shortens your final drive to 4.44, so your car would feel like it has more zip to it