@newls1
A kill switch is a must before running your truck. Sometimes your electronic may fail, or the throttle servo stays stuck wide open resulting in a runaway truck that can hit something or worse someone resulting in costly repairs and or hospital bills. It will allow you to remotely cut off the engine or will cut off the engine on its own and apply brake (if setup that way) when there is a glitch or lack of communication between your radio and truck.
The one I use is the
KillerRC kill switch.
Another upgrade (highly recommended if you ask me) is to get an aluminum transmission plate. Check
@Ol' fart 7075rc website for aluminum parts for the redcat X series vehicle (XB, XT, Chimera, XR)
While you wait, get acquainted with how to tune a 1/5 scale RC engine (2 stroke).