HP's MPVI2, MPVI2+, and MPVI3 interfaces allows you to connect to your computer to your vehicle to read and write tunes amongst other features.. This is for the interface only (no tunes or credits).
MPVI2 or MPVI2+ WITH PRO TOOLS FEATURE is currently required for all JTEC tuning (96-05) (MPVI3 does not support JTEC as of this moment)
MPVI3 comes standard with the Pro Tools Feature