I think the rtr (13.5t) uses something like 29/81.
Which is pretty much on the limit of what the motor plate will allow. So you might be ok. But only with a 29. (Might be ok to 30, but not sure.)
Might be worth getting 2 or 3 pinions, so you can play with the ratio based on esc settings (boost, timing, turbo etc)
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