8.1 L engine computor module performance up grade

I had the Ultra done on my 8.1. It helps in all aspects of driving and it is set up for what you normally do. If you tow and drive in the mountains it will be programmed differently than if you are a flatlander. I figure it was money well spent. Jon sent me a module to plug in to my OBDII post for me to drive with for awhile. Then they programmed it for what I wanted and gave the before and after specs. I kept my old ECM for a spare.