Walker “Sound FX” vs “Quite Flow 3” mufflers

Just because I'm curious, is this a sleeper thing or do you just genuinely want a quieter car? I did a cam swap on my Viper a while back and have never been able to quiet it down since. Just not a lot of market for quiet with those cars, especially when you need 3" exhaust to go with it. Not a commonly searched set of terms it seems, lol.