i had a revo years ago, i really liked that truck but i couldnt tune the engine no matter what i did. i just boiled it down to faulty engines as i had no problems tuning other engines.
hopefully you will find one mate 🙂
about your hyper gt shell, will you be like me? just use a battered shell instead of using your new shell?
i do the same with the wheels too, new things for ornament kind of thing.