I think everyone has valid points and just my .02 here, but I think to have any useful graph's to determine where in the powerband the most power is being made, the hp, torque etc that it would have to be similar to how you test power making combo's in a car on a dyno. I say "power making combo" because, correct me if I'm wrong here, but each of these exceptional pipes require different engine setups to work to their full potential.
I know not everyone is a car guy, but for example, I am not going to run a 2500 rpm stall converter in my race car with an engine setup to make all the power after 4500 rpms, just like I wouldn't use a dual plane manifold when a single plane is better suited, so I certainly see the issue with running all pipes on the same bike to graph out. But as I said, treat it like dynoing power combo's in a car. Use the same bike and change out the top ends, carbs, etc to what each builder specifies, have them tune, jet etc to optimal setup and run it 3 or 4 times, disassemble and then the next builder installs their setup, tune, run, and so on. I know that would certainly take some time and you still have a lot of variables, but I don't see another way to keep it as comparable.
Plus I don't personally see it as who has the best, but really more of where the power comes on in each one. I wouldn't want a setup that makes all the power in the top end when all I want to do is rip around or have a low end grunt pipe when I want to drag race all day (I'm too old for that now)
Having said all that, I joined here and other sites to learn everything I can and also, to help others in their quest to make their machines better with any info I can provide, regardless if I learned it from here, another site or my own personal experience. I am thankful that I have gained a few friends and riden with some on here as well.
I don't think there is any real solution, I think each builder has spent a lot of time and money and each pipe is exceptional in what it was designed to do. I just appreciate the fact that there are people that are still busting their butt and continue to come up with new performance parts, be it pipes, machining, o-ringing, rebuilding shocks, billet washers, hybrid kits, and on and on.
If you think about it, we all are on the same team......we all love blue and yellow and were always trying to make them better
Bottom line is...and this is coming from a rookie poster with all of about 50 some posts so it may not mean much or carry any weight, but I appreciate what you
ALL do for the sport!