Everything that is available is louder than stock. If you don't like noise, you won't like anything else.
I like the rasp of the Bursch personally, but it's too loud. I also like the Triad. It's a much lower, more bass type noise. It's also pretty heavy, but bulletproof and looks really badass in the dual outlet config. And having said that, I swapped mine out for stock muffler before the last 800 mile round trip I took because of the level of noise.
I came to find out that the stock muffler on my carb'd 2056 sounded really good and not too loud, but not to quiet either (probably because of the carbs). I'm pretty sure it didn't do a thing for perfromance, but I drive it all the time so the noise was more of a factor.
YMMV...