TRX EZ-Start on any Engine!
In my honest opinion, unless you already have ALL of the Easy Start pieces to do the conversion. Your looking probably close to $100 us for everything, and adding alot of weight high up in the chassis that will effect the handling.
You could by a RTR Starter Box for about the same price and us it with more than 1 Car.
BUT, this is ONLY my opinion.
BTW, I have an O.S. CVRX-15 in our T-Maxx. I moddified the Easy-Start to fit, but removed it because of the extra weight (quite a bit). It is a trade off I guess.