Finally found time to install the 123+tune yesterday. Install went pretty much by the book. Only hitch was looking for the "green light" through the window on the outside of the body. ATTENTION!! the green light will be on the inside of the distributor, under the rotor. Other than scratching a bald spot on my head for half an hour, I finally reread the book for the 25th time and the light in my head went off. There it was - the green light. She started right up. Went for my first ride in the evening. The engine runs significantly smoother with the curve native to the distributor. After the New Year, I will start playing with custom settings. So far this is a great improvement. I may have done something better to the car over the years, but I just cant think of any. Thumbs up!!!