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My dynomax Super turbo's were pretty quiet on my C4 (daily driver). When you nailed the gas they would come alive, but noway near that of Flowmaster or Borlas.
I did not want anything as loud as the flowmasters, so I went with the Dynomax Super Turbos. I am happy with the choice. Relativelty quiet, but still has a nice sound when you get on it.
A year ago when I put my Dynomax Ultraflows on I thought they were quieter than the stock mufflers I had. But since then they've "broken in". I was driving the other day and gave them a rap as I was going under an overpass. I think I gave a couple sedan drivers a coronary.
Dynomax Super Turbos are about the best quieter performance mufflers. I have them and they are a little louder than stock but still sound like a Vette should sound.
They would be a but quieter if I were running cats.