I?m looking to get a MPVI2 for my dad as a present to tune his C7 A6 3.0t.. transmission ONLY. ECU is already tuned. I thought I was all set and called summit to order, but the sales person was convinced I needed the Pro interface upgrade to do the TCU?. Anyone know if that?s true or can clarify? It?s a ZF8. And It?s four credits correct? Thank you