Hi, I just ordered the MPVI3. I have a 2010 C6 Grand Sport. HP Tuners page says I need 2 credits, but in some research I was doing it seems possible I need to purchase additional separate credits for tuning the trans. Appreciate any insights. For what its worth, I'm only planning on monitoring my drag racing runs (but do want to see what the trans is doing) and loading any tune mods my tuner/shop sends me. TIA!