dyno-max mufflers good / bad?

I've installed no less than 14 sets of TTI's with their dynomax super turbo's and they sound great.These were installed on cars from stock internal 318's to 472 Hemi's and all in between. Last set was on a 79 Chrysler 300 with a stock E-58 360. Good rumble at idle and at cruise with not too much drone. I have a video of a stock Poly 318 with their headers and exhaust but can't get it to load. I will keep trying.

Didn't work ^^^^ Rats !