The guy who designed the Dynamax would disagree that it is designed around the .77. Also, did O.S. recently start recommending the Ramtec? With the dozen or so that I've owned, I never read that. The notion that the Dynamax over-revvs the .91 is an urban legend.

As far as the Dynamax vs. Viojett question, I'm pretty convinced it's a question of inlet design. In non-BVM designed planes, retrofitting of the Viojett system hasn't made any performance difference at all except when you're able to change the inlet too. With the BVM fan AND inlet, you see a noticeable difference in performance.