what kind of mileage gains does a dp tuner give you on a 1999 powerstroke with a 2002 motor in it?
Still the 1999 one, i guess they changed the injecters to fire more times for 2002 or something. but it is probabaly not doing that because of the older PCM.Do you have the 2002 PCM installed too or just the motor? Econo tune, maybe 3mpg gain. Any power tune and you're right foot gets heavy for some reason
I belive he has a tune that can activate it for a exhaust brake tune or something. They can also turn it off as well. In my hi idle i had Jody turn it off so it doesnt make that horrible noise when its warming up in the winter