They do a nice job at www.hypertech.com on the pp3 unit. You can compensate for gears, and different sized tires as well. Does everything that diablo does. You just dont have to pull it out and re-flash it with each mod. Now ebay has one for $298 new which is a good deal. On used Hypertech units, they only work on the SAME year car that they lost their virginity too. Remember that if buying used!!