I have a 2004 Cobra. Supported vehicle list says Mpvi2 only works for this so that is what I have been using. Do I need to log with Mpvi3 and tune with Mpvi2?
MPVI3 scanning is likely going to be better for EECV, MPVI3 editing/flashing are going to work similar to MPVI2. If you have one of each device we would recommend combining them unless you need them separately for some reason.
You can open a support ticket here https://support.hptuners.com/