the fr500s is 100hp less. I asked Dean Martin and Jim seafuse both differences between boss and 4 cam modular fr500c. dean said 4 cam modular R50 was torque monster ,lower rpm. boss was high revingI seem to remember that the that the FR500C is about 100 hp less? Makes me thinks this would not be ideal on the coyote.
jim seafuse hated suspension in his boss R he swapped it for the fr500c stuff. he liked modular motor better than boss. but i assume with all changes performs better.