Dyno measurements are worthless as far as I am concerned. Too many variables and reproducibility is poor at best. I can get a Dyno to support or refute any theory I want if I cherry pick the data and conditions.
I prefer solid engineering basics and evaluation to determine what works best. There is no doubt that a straight through muffler design will out perform a redirected baffled design that causes exhaust gases to follow a twisted path. It’s simple physics that can’t be refuted by a dyno run saying otherwise.
