you only need the normal trex 600 n , i have this model fitted with a CY-MP5 pipe on the Hyper 50 engine , belt drive is alot safer than torque tube if you crash as most of the time you only need to replace the cheap boom but with the torque drive you need to replace the drive shaft etc etc as well. there are heaps of up grades that you can buy when you feel its time for them, so just go the normal 600 nitro.