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I have an old workhorse chassis that has a 496cid chevy V8 with an Allison Tranny.
When going through the mountains, I felt I needed more power, too. I looked at Banks and didn't want to do all the work. I found Ultra RV Products in New Jersey. They sell computer upgrades for the workhorse and the Ford V10 used in almost all new MHs.
I bought one and installed it in about 10 minutes. Three bolts and a connector. Right under the engine cover. I figure I only realized about 30 HP and about 30 ft-lbs of torque but my gas mileage went from 7 mpg to 8.5. I got 9.4 in the low country last fall. The difference in mileage paid for the computer in one summer. It also runs smoother and starts easier. I paid $575 for the thing and I totally recommend them.
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