Are dynomax super turbo mufflers worth the cost?

I have a videoclip on my site showing the difference in sound between a pair of 17748 Dynomax mufflers and open tubes.
Not the most scientific way of testing but it might give you an idea of how much a Dynomax mufflers 'muffles'...

Open exhaust vs Dynomax Exhaust mufflers sound level difference