ive got forsale my project that never took off , now these are rollers and need building up and could have stuff missing ,there is a gx21 engine that has great compression but untested by me im pretty sure it will run fine , there is enough spares for another roller near enough but i think it would need diffs for that well the diff ring gear , hyper 7 diffs are a great upgrade apparently , it would need to be picked up preferbly or arrange your own currier , i think i may have a few other bits laying about like a couple of springs and shocks , i will have a look and pop them in the box if i find them , im asking