Loudmouth is very loud........just like the name says. I loved mine on my LT1 SS, but its not for everyone. It IS the exhaust for you, if you want people to hear you coming before they can see you.

Mufflex with a Spintech muffler sounds awesome on the LS1, especially cammed. And actually the Borla and the Corsa sound pretty cool on the LS1 also.