The idea that Honda would not have an optimum design is ludicrous. That is what they DO.
If there was a mpg improvement, or a few more HP available for what would amount to no more than a simple design change, they would have done it already. The cost at the design/manufacturing level would be zero.
I think the aftermarket market is based on hype, combined with a certain need to mod your own vehicle. It is truly a compulsion. Look what I did to MY truck/car/motorcycle. I've seen it over and over.
Most mods will not only not deliver what is advertised, but often WILL shorten the life of your vehicle, violate smog laws in many states, and reduce your chances of having any warranty work paid for by Honda.
But my opinion won't change the compulsion. Mod away y'all. Its your truck.
(feeling a little cynical this evening... sorry.
)