Depends on what you call sound good. Besides horsepower takes on many sounds. What sounds good to you may not sound good to me.
Dynatechs look good but I hate that I keep seeing the only way for them to sound good is with the MAC Mufflers. I'll never run a Mac product on my cars.
ARH look solid, and the Tasca car running the 2.9L with 1 7/8" catted ARH and Corsa axle back sounds like sex.