I have a 2010 6.4 PS. It currently has an unknown tune on it and I’m looking into H&S. I have a few questions. Will the tunes come pre loaded on the Mini Maxx? Will it automatically overwrite the tune I already have on my truck?
Unless there was a Spartan tuner installed previously you should be able to overwrite whats currently there. Worse case scenario you have the ECM flashed by the dealer back to stock, then you can install the mini maxx.