he must be a cummings mechanic.....300hp stock plus 90 hp injectors 30hp from exhaust and intake another 20 from boost valve then take into parasitic loss=400hp yep
brother I would get efi live with your injectors if budget allows it is worth it there are so many benefits from it and its a stepping stone and if your anywhere near fleece or Danville they can tune your truck from the seat and give you the max power and reliability and once you build your trans u can just get it updated for me my updates are free