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A backend flash is an ECU flash tune designed to generally control fueling and timing amongst other things, leaving the piggyback to control boost, maybe some fueling and maybe some meth. It is necessary when wanting to run higher concentrations of ethanol as the stock DME fuel scalars were designed to run only petroleum or very low ethanol blends.
In my case, I have a Cobb backend flash which controls fueling, AFRs, timing etc. My Procede controls the boost and methanol.
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