I have a DC Sports one.
It's pretty quiet comparable to others I've heard, but I guess it depends on what level of noise you're used to. Cruising around, below 2-3k rpms, my foot light on the throttle, I can't hear it at all.
here's a story:
The day I had my exhaust put on, I had to go pick up my gf. I went to pick her up (campus police around, so I went *really* slow), and on the way home she asked if I put it on yet. I'm like, "Yeah." She's like, "How come I don't hear anything?". I'm then itching to floor it, but can't (campus police), so afterwards when she gets out, I show her it's on
Now that she recognizes it's tone, she can tell when I'm coming down the street.
