Thanks for the replies, but no one really answered my question so I will be really specific. I am going to rebuild my engine and want more power. The upgrades that I think would work the best for me would be a better cam, and exhaust. The cam I am looking at has 204/216 degrees duration with about .450" lift. The header would be the only one that I could find that has the emissions which is a summit header. I have been told that the stock computer doesn't respond well to upgrades. Does anyone know if these upgrades would work OK on the stock computer. If not, what upgrades do work well with the computer. I have heard that switching to mass air works, but this is a $1000 plus upgrade. Would it be cheaper and easier to just have a new chip burned to my specs and keep the current EFI. Has anyone had a new chip burn't and how did it workout. FYI I will use my truck 80% road, 20% trails, with very light towing, under 2000lbs. Also, how does the cam sound, and do you think new valve springs would be in order. Any help would be appreciated.