Vec2
Marc,
It is truly plug and play. I've got the complete Vec2 with plug in harness on mine and it couldn't be simpler. I changed cards and flashed a moderate cruising program into mine, and took a 1300 mile trip last week through the mountains in Tennessee and Georgia. I averaged 15.8 mpg from start to finish. I changed back to one of my better dyno performance cards after I got back to town for my day to day driving.
The cool part is if I had wanted to do any "spirited driving", I could change out the card, flash the memory for total performance, and change back to a cruising setting and continue to roll on getting pretty decent milage.
Mark