Got a friend with a worked over 2008 (427ci stroked LS3), started out with a Stainless works exhaust and it was to loud , after listening to several others , like the Corsa Xtreme , Bassini , flomaster , Bullet and a couple others he went with the Borla .
Running "Kooks" long tube headers it sounds realy good , really deep and throaty not that overly loud ,raspy ,poppy sound that the Stainless Works exhaust gave.
if you want a loud ,really aggressive exhaust check out Stainless Works but its anoying to ride in the car more than a few min if your doing anything other than looking for trouble