The Kit comes with a 13t, a 12t is nicer on the track as you dont need the top end so much, it also keeps things a little cooler.
In terms of Power cap - the Bec on the ESC is pretty good theough the cap never hurts TBH. It really depends what you do with the steering servo.. I have always run Spekky in mine with no cap and an Ace and not had a single issue - if you start putting 30kg Robot servos in there its time to get the caps out!
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