Not quite sure if I should put my pulley on yet after I receive it soon without getting a tune, colder plugs, heat exchanger, Johnson pump and thermostat. I don't want to take a chance since it has been pretty steamy down here in Orlando. On second thought, I can put it on and not keep it at high rpm's for awhile until the other upgrades do get done. I'm sure just a few spurts every now and the shouldn't harm anything.