Several on here have done the "5 Star" computer programing. I personally don't see the need to spend $500+ to have the transmission shift differently. Most are saying no difference in performance or fuel economy using it. And, no, I'm not an old fuddy-duddy... I have a 99 Dodge Dakota the is fully computer controlled using the SCT format that I drag race & show. That said, I made my own fresh air/larger air filter assembly on my E450 based class C with V-10 power. If you want any help/suggestions making a fresh air intake I'm here for questions.
p.s. I may be a bit slow responding the next few days. We are leaving for Cabo tomorrow.
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