I've come to the assumption that most PSD owners bought their trucks because everyone else did. In general they know very little about their trucks most can't even tell you what gear ratio their truck has in it. Heck the first thing I did when my truck came in was pop the hood and crawl under it to make sure they actually put the heavy duty t-case in like I ordered it with. The salesman thought I was nuts he said,"Close the hood someone is going to think something is wrong with it". Forget about trying to talk egt's and boost pressure with a PSD owner if you watch their eyes you can see them glaze over cause you are talking over their head.