I have the 4'' HOG stainless system.. I'm running the chromed muffler that came with it.. It has a nice moan, definately louder than the stock system, though not loud enough to upset the neighbors.. In cab noise is minimal.. As far as exhaust systems go, I don't see a downside to it, except one... The install went anything but smoothe... nothing seemed to fit "just right".. If you can get past the install, the system is nice...