Isx help

[SquareOne]

What are you using to monitor boost pressure? Thats a load of boost psi! Are you sure the gauge is accurate?

Also, I know you don't want to hear about the tune file, but that IS most likely your biggest issue currently. Would most likely be a different truck with the proper adjustments.

What are you hauling with your setup? Even though the rears and the big nose are def. hurting you, I can't imagine 6mpg or less as an average being something to be ok with....unless you do oversized or some heavy haul??