I ordered this today and will be installing it this week end. The predator down loads your stock settings into the controller and then you install a choice of option tunes. The predator stores your settings and you can replace them when you take your car to the dealer. Then you simply reinstall your performance tune. I really did'nt expect to see the results I saw. The shifts were crisp and loss of traction on dry pavement in the 1-2 shift let you know it was putting the ponies down. I will post when I have loaded my 93 oct. tune with open element and exhaust. I think I will be suprised by the results. It also has 91 oct. tune and custom tunes as well. Takes about 20 min. to store stock tune and install performance tune. Real simple and easy to follow directions.