'04 Ram 2500 Cummins with 35" Nittos. Not being very tech savvy I chose to install Program #2 (towing) to compensate for the oversized tires and for more torque while towing our 23' toy hualer. Installation was easy, including recalibration of the speedometer. Better throttle response and more power were immediately obvious and my fuel economy increased by 1.5-2 mpg. The truck also tows our trailer with much less effort. I am very satisfied with the Smarty Jr.
Wider selection of tunes would be nice
Of the included tunes, only 2 do not require premium fuel. A high mileage, and an 87 tune. Of the two, I really can't tell much difference between them. Both do speed up the gear changes and feel a bit more torque, but the fuel economy in the high mileage tune is no better than stock. Fuel economy in the 87 tune is also not much different from stock. A wider selection would be a good upgrade. As to the hardware, it is easy enough to use, if a bit slow. About 15 min to load a tune in 5.7L Hemi
A good product, but it could be better
installation was easy and simple. Beside drilling in exhaust manifold for egt sensor and dashboard for the switch, everything else was plug and play. Which is great when something go wrong, just pull over and disconnect three wire harnesses, plug in original and drive on till you can investigate the problem properly or call tech support; Which I had to do. I would write the whole experience, but I'm limited to 500 character. Let's just say it was a three weeks of drama so far and good result.