That's a good one. I know long term the CAT and DPF installed and running 1.20 will plug or ruin the DPF. I would think this would take a lot more than one test drive to work. If the stock file is in the truck, could try reformmatting the Livewire then loading the latest firmware and tune revision(1.20). PM me if you want help with reformat. This is basically a way completely "clean" the livewire memory.