Why guess or trust some software program?? In an area like Ft. Worth and Dallas I would imagine there are a number of shops who'll run the truck on their chassis dyno. Great way to check what your real power to the pavement is and it will also give you a lot of information as to where your tune-up is at. We do the drag cars on a chassis dyno every spring, usually make a pull, do some tuning, then another pull to verify the results of the tune are going in the right direction. I think we learn more in those two pulls then making a half dozen or more runs at the track.

The dyno simulations are good, but you'll need to supply a lot more information on the engine then you have now. Usually the dyno sims are used before you start buying parts to give a good comparison of part A vs. Part B, this cam vs. that cam, etc. Once the engine is done, a chassis dyno will let you know where the power really is, not what it should be....