50-60 cetane????? Never seen anything over 45 in Kentucky. Isn't one reason for running additives to give back lubricity that was lost when it went to ulsd? If that's the cause lubricity could defiantly make an audible difference.
I don't think there is a mount for the livewire yet. I'd say x4 with IDP tuning and have mike set you up with a stage 1 intake and egr delete, cold side pipe if you really want to clean it up some.