I run my GTP on 5s with a 2200 and it is insane. You will kill in the straights but will loose it accelerating out of the corners. Way to much torque in the 2200 but great for bashing.
CF Ofna GTP II Extended Chassis Castle/Flux 2200kv 6s
CF Ofna DM-1 Pro CC1717
CF Sportswerks Mayhem ST
CF Losi LST2