I saw where trick flow has pulleys out for the 6.0L now. something about 25% under driven bla bla bla..... anyway in the back of my mine im thinking i read on here that some one had swapped a crank pulley off a 8.1L for 6.0L and it worked fine... IF thats the case i wounder if i could swap my stock 8.1L for a trick flow crank pulley? Pick up some power and revve quicker.