Sorry to have not responded to some queries...been at work.
I see some misconceptions regarding the process.
Generally, the process seeks to class cars into four performance envelopes It uses factory hp ratings, and applies gains that are expected from IT prep. Now, as there are different architectures of engines out there, and we class cars from the 70s thru the 2000s, we deal with a wide range of potential, and we choose from a range of potential gains. Obviously, different architectures get treated differently. We use a framework to choose the gain, then draw on the collective knowledge of the 9 ITAC members and the CRB liasions (when asked) to run "sanity checks".
Also, we apply adders and subtractors to account for a cars mechanical makeup....killer brakes, IRS, etc. Sometimes those stack up, sometimes they cancel out.
Finally, we consider if the weight makes sense. Does it fit the class? Can the car get to the weight?
In the end, it is realized that no formula or process will ever be absolutely perfect, and the system has methods of dealing with gross mistakes.
Ideally, we see some cars that excel on some tracks when prepped to the nines and driven by Gods, but are merely adequate on others...and vice versa, but it's impossible to draw super fine conclusions about the math from on track erformances as the variables are just too great.
The amount of weight that would result from a 5 hp "misclass" varies depending on the class of course. In this case, it's well below the 105 number that was suggested.
One other point....IF there was a misclass, was it really 5 hp? I see some opinions here that the ECU issue is responsible, if so, it's a moot point...but I also see opinions that a late year compression bump is responsible. I'd think that in reality, IF those numbers are accurate, it's a combination, so we're really talking about a possible 2 - 2.5 hp misclass. Which is a weight misclass, off the top of my head, in the 25 -35 pound range, give or take a pound or two.