I'm am new to HP tuners, currently in the final steps to complete my v8 swap. I have ordered the MPVI2 and am looking in to getting a E38 ECM to work with a truck that had a E37 ECM installed. I have read through the forum looking for answers, but get mixed results. My main question is, to get the truck to run do I need to swap vins and delete VATS or just link my ECM with VCM editor and delete vats. I'm trying to prevent wasting credits if its not going to work. Any info will work, thank you for your time.