| for our cars. ~12hp is what is about what is seen on our cars with an underdrive pulley that is also lightened. Your assumption would imply that a light weight pulley would do 12hp and a combo would do more (or that almost all the increase is due to the weight and almost none to the underdrive). As far as i could tell, unorthodox was one of the only pulley manufacturers offering just a lightweight version of pulleys. All others are underdrive and lightweight and say that the gains are from reduction in parasitic drag caused by the accessories.
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