WHy order a whipple 8 rib pulley? Your truck has an eaton supercharger, not a whipple. You dont need to swap out the upper pulley, if you order a 6lb lower pulley for the lightning, it will up the boost by 4lbs on your HD. Also, get a new set of plugs, the TR6's gapped between .35 and .38 will suit you fine.