Hello. I bought a Stadium 2wd for $75 used. I've had a blast bashing with it, and I've ordered 2s 5000ma lipos. I'm considering a brushless Onyx 4000kv motor and esc, but I don't know what all is involved. Will I need a new receiver? Metal gears? I don't want to break stuff yet, just bash with my kids. Any help is appreciated.