What would you guys consider mandatory upgrades, for either the RTR or the kit. I have the RTR, and the first thing to go was the upper crank bell. After replacing that with the CNC unit, the next thing I broke was a steering knuckle. I have the CNC ones on order (kinda expensive) I've bent my stock front shock tower, and I bent it back, but I now find it bends quite easily, so I've ordered the CNC front shock tower now.