Here are 2 of past posts I made for the Tuner I have. Check out there website, it works and is noticable.
One other item I have added is a TSdieselperformace chip (plug-in box). This makes a difference that you can feel, if you are driving and turn the dial from off to all the way on, you can feel it. The cruise control goes from fluctuating the throttle all the time to being able to hold a constant speed with out contstantly on the gas/off the gas. There is also more power for towing and hill climbing. Not sure my mileage is any better yet, but it is worth it for the extra power. Does not change or mess with ECM so will not show up if they plug in to your ECM that you made any changes, if you are having any engine work done you will still want to unplug/remove it so they do not see it.
Here is website
http://www.tsdieselperformance.com/site ... ge/1095737
It might be awhile, but so far it seems to be around 1 mpg better. Controller has been in for about 2000 miles and not a problem, engine is smoother and not working as hard, has a little extra pull when going up steep hills.
As far as warranty, go to TSdiesel website and it tells you what the box does. You actually plug it into the port on top of the passenger side valve cover. What it mainly does is increase the fuel pressure at the injectors. It keeps it under the safe limits of the injectors, but alot higher then the factory. You are not changing the ECM at all or the turbo.
I had it in for all that warranty work and before I took it in I unhooked the controller and plugged it back in the stock way. They never said a word to me and it did not show up when they plugged into the computor.
International actually will sell a higher performance program for your ECM, I think it was between $700-900.