I've seen lists like this before, but in searching can't find one on this site. Other sites I used to frequent are dead, so I'm hoping folks here can help out.

I'm looking for a list of performance mod's you've added to your truck, and what the net Horsepower or Fuel Mileage gains were. We all see what the manufacturer's advertise but this is a good way to see some real world results.

FTW used to have a thread that was a list of 97 - 03 4.2 mods that was extremely helpful when making performance mod purchases. Anything like that going on here for the different engines?