Good product, does what I needed it to
As my title states, it's a good product and calibrated my speedo since I put 35's on. The only reason I give it 4/5 starts instead of 5/5 is because I had to put 33's in the programmer to calibrate my speedo correctly. When I put 35's and went for a drive, my speedo read 70mph when I was barely doing 60mph, what the heck? So I had to calibrate my truck about 4 times to get it dead on which was a bit annoying, but it eventually worked. Worth the $200 for me, I can't stand my speedo being off!
Hypertech Calibrator keeps it all legal
Purchased this after having my son's truck lifted with 35" tires. We wanted to capture his desire to have the look of a big truck while still maintaining the correct speedometer readings and transmission shift points. The system does require you to use a Windows based PC to update the unit to the most recent software package (it is not Mac compatible), but other than that it is very straight forward to use. Hook it to the OBD port, input your tire size and allow it to update your ECM, that's it.