I also am looking for an exhaust system for my Sierra 6.2, double cab, all terrain and am not having much luck. It seems short of having a system put together (Muffler, custom bent pipes and tips) there aren't many options. I really wanted a Corsa system, but... nothing. I also wanted to have the same diameter pipes (3.5 inches I think...) all the way back to the tips, which I want to exit slanted behind each rear wheel.
I want it to rumble at idle.... no drone at 60-70 mph, but want it to growl and howl when the go pedal is mashed. This motor is a 376 cubic inch monster, and to not have the major exhaust companies design a bolt on cat back system for them is amazing to me.
Anyone had any luck with a finding / installing a cat back bolt on system?
(Hey.. if 'they' need a test truck to put one on, I'll offer mine up! )