The patch did wonders for me. I actually used it to quit chewing Copenhagen after 12 years. Wish it would work for my truck. The truck runs great other than the smoke. The only other issue I have with it is that it has dead spots in acceleration. I usually don't have a problem with it unless I am going up a grade, right around 60-65 mph. If I get on it, the truck will do nothing, RPM's don't go up, no down shift, nothing. The pedal will go all the way to the floor and nothing happens for at least 5-10 seconds. It almost got me into trouble because I was trying to pass a car on the highway. Under normal circumstances I would have been off like a shot but I really ticked off the guy I eventually cut off. It usually doesn't effect me that much, I have just learned to start accelerating before I change lanes to make sure my 6.0 has the same plan as I do.