Superchips FlashCal F5
I bought it to calibrate the speedometer after getting bigger tires and changing gear sets in my jeep. It worked flawlessly and it took only a few minutes to use. The screen is very useful and the tool is straight forward and easy to use. It can reset and check engine light codes and many other things. I would definitely recommend this product to others.
Very easy to use. Just follow the directions. Received the BullyDog BDX one evening and had my truck programmed the same evening. There are several settings. I only chose a couple to begin with, but noticed the extra power immediately. Ibis will it set in economy right now, but I haven't noticed a tremendous increase in mpg yet. I mainly got it for towing my camper which is 37' bumper pull and weighs 8800 pounds in the dry. So far, I am very pleased with the BDX.