Bought hp tuners pro and want to tune a few cars without buying to many credits. I'd like to change all my 411 ecms either to the same vin as my 02 Tahoe that I want to tune or a different 02 Tahoe vin for each?? Can you tune multiple vehicles with the same vin after the ecm vin has been changed or that will cause issues? If I can't do that id just make all my 411 ecms to another 02 Tahoe vin so after I pay the 6 credits I'd be able to tune unlimited 02 Tahoe for free. If that's doable who can do the vin change in the ecm for a good price? Thanks for any insight on this!