before i pulled the JR off of my truck i read it and saved it then reset the truck to stock and got my stock file also then i wrote my own tune from scratch but i did run a side by side with the JR and stock tunes just to see what they done and basicly all i seen was the fuel to boost maps and throttle to fuel maps different the pulse width was the same as stock on the main injection......are their some tables that were not seeing that possibly the JR was changing?