[Hunner]

Whoa horsey. I don't make attacks that was just about as silly as your statements. I made my comment because it sounded like a very negative attitude like all these people are lying about their products. Nobody is going to make you buy anything to improve performance. I do know some that dynoed with positive results. It just hit me that "here is somebody else that wants an education by getting people to do the research for him and still be doubtful of the results." So don't worry about it. I personally bought a PCM outright and have one programmed, end of problem.
I also have a diesel and it's a 95 Cummins and it's all mechanical to modify it. No electronic mumbo jumbo you actually have to get your hands dirty. I dynoed it at each stage and the same type of products showed positive results. But what does that have to do with a H3 I-5 except it tows mine real good on long hauls. What the heck something worked!