I didnt think they did either but thats what the previous owner told me he put in it. Does it hurt the motor or make any power difference? I want to change the coolant and thermostat soon as its starting to warm up finally. I do have a new set of coils bc i heard that the msd coils go bad so im prepared now. Also i forgot to mention that the previous owner dropped a pulley size as well. that makes a difference, he said he only went one size down but couldnt remember what size it was.