I just installed a ts performance 6 pos chip on my 01 powerstroke and am not all that pleased. When I first installed and took down the road I noticed that when pulling hard such as a hill it pulled strong then the engine stopped reving like hitting a govenor and didn't make anymore power. After reading other threads I determined it was overboost. I had an air regulator so I spliced it in front of the map sensor to eliminate the problem. This worked but the truck does not seem to have picked up much power now. Could this be limiting the fuel the chip gives by the computer not reading full boost and not allowing full throttle? The 140 horse tune has no power over the 100 horse tune and the 100 is not much stronger than the 50 or 75. Could I have been expecting too much?