Hey, I just ordered RCM mod 1 28T and 30T pinions for the GTP's. Had to mention it for those days you feel like doing a speed run with your carbon chassis.
I am currently running a 24t in my GTP with my Castle 2200 combo. On 6s I should be able to hit 100. on 4 and 5s it is somewhat controllable but all the way fun.
CF Ofna GTP II Extended Chassis Castle/Flux 2200kv 6s
CF Ofna DM-1 Pro CC1717
CF Sportswerks Mayhem ST
CF Losi LST2