Cole - if you want to keep some parts then front C-hubs, front lower arms and driveshafts (if you will be running plastic ones) are the things that will most likely break when scuffing the boards.
I have run 2 races with my MI2, ~20 packs with practice, no problems besides broken diff screw (probably my fault, I overtightened it while trying to get normal diff to act more like a spool) and one front driveshaft (when running an actual spool and hitting a wall _hard_). Shafts got replaced by metal ones after that. But I have seen others break the C-hubs and lower arms, so it can be done
C-hubs with different caster angle are nice to have anyway, as it is also a tuning aid. The stock 4 degree pieces will be available as alloy too, but I don't know if they are available yet.