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You can buy the Dynosty kit from frsmod.com or dynosty.com. I doubt that it does any more to reduce noise than just plugging the hole in the passenger side firewall, but it is a nice-looking aluminum plug with a beveled outside edge that looks like a factory piece at the air intake. What it does is get rid of three feet of useless tubing and the sound generator itself, making that side of the engine bay much more open.
It is very difficult to guess at relative loudness, but a sound meter is a pretty straightforward piece of gear and says that at 70 mph cruising, the actual acoustic power per unit area will be reduced by more than 90%, which the ear hears as a little more than half. To put this in perspective, eliminating all other sources of noise will not reduce noise in the car at cruise by as much as getting rid of the sound generator.
I stand ready to be corrected by anyone doing the sound meter tests. The difficulty of estimating this by ear alone is complicated the harsh rasp of the sound generator compared to normal road, car and engine sounds. About the only good thing I can say about the sound generator is that it lets those who want an obnoxiously loud car keep more of the goodness inside without having to rely on a loud muffler.
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