I thought I'd post something as obviously this topic draws a lot of energy out. Take this as the opinion of an outsider looking in...I do not believe there is a problem with cheating in any nasa class, but I do believe there is a problem with continual escalation of complexity and cost to any component of a race car that cannot be limited and policed.
I come from the AI and CMC world, where dynos have been around since the rules started. We have a dyno procedure that minimizes the variables involved quite well, and even to this day we make adjustments to it here and there to make it better. If 944 is going to use dynos I would certainly encourage the decision makers to adopt the same procedure for standardization purposes.
The natural evolution of race classes is for the drivers to push the limits of the envelope. Yes, seat time is king, but the car gets the brunt of the focus. Make no mistake about it, as the class grows in popularity and the rewards of placing on the podium increase, the desire to push the envelope increases as well. Things that were completely at one time are a "must do" as the driver/car grows with the competition. Anything that has no limit will get pushed and pushed and pushed. In the end, the only protection from continual escalation is limits on what you can do that can be enforced. Power is one of the big ones.
I would propose that the absence of dyno testing is far worse than the issues dynos bring. That's because the only alternative is engine and drivetrain tear downs. Does anyone want to disassemble their transmission to prove they have not mirror polished their gears to reduce friction? Does anyone want to take their engine apart down to the crank? Does anyone want to spend four hours in post race tech and push their car home with several boxes of parts? Honda Challenge and Spec Miata are the two largest classes that do not have dyno rules and guess what, that is exactly what you see at Nationals. Meanwhile AI, FFR, and CMC (all dyno classes) were out of post race tech within the hour other than for dynos since those are one at a time.
There is no free lunch. No, this hasnt been an issue and probably wont be for some time. Yes, eventually people will do things that most of us wouldnt to get that little edge. Clear and easily obtained limits are the way to go.