Jeepers, 64 HP? that is pretty good....even stock it produces the most of any 2018 bike (according to their dyno). Still $4k a lot to fork out for that 64 HP!
https://motocrossactionmag.com/mxa-team-tested-pro-circuit-crf450-engine-package/
Current rides: 2022 CRF450RWE
Occasional ride for VMX: 1985 CR500RF 1987 CR250RH
Adventure/Road bike: CRF1100L