2650 works well in a buggy with 4s. reason i mentioned 6s is op wanted 80 mph
truggy is better suited to 2000-2200kv on 5-6s (just make sure your tyres are glued on )

people get confused with high voltage a lot. higher voltage is better for less heat, but KV must be lowered.
EG= A 2,000kv motor on 6s will rev the same as a 4,000kv motor on 3s but have more torque and use nearly half the amperage.

another motor to try is the leopard