Being that we're all older than dirt around here, hopefully some will realize a "DYNOMAX SUPER TURBO" is nothing more than a 1960's Chevy Corvair Turbo muffler with 1. less packing to make it louder and 2. two little stamped "flow directors"?

And due to Walker/Dynomax's marketing genius, they have been able to sell them at triple the price of the original Corvair muffler since day one.

They do sound nice! And they are indeed slightly better than the original turbo muffler (or at least they used to be.....before they reduced the pipe sizes internally).

But they aren't a race muffler, and never were.
They are based on an OEM Chevrolet part, so it's not really fair to expect much from them.