Check out this teaser of what AWE's cat-back exhaust for the Sierra AT4X sounds like.
"0FG Catbacks are comin' soon for the #SilveradoZR2 and #SierraATX4, complete with options for signature AWE tips or AWE's BashGuard™. Sign up to be notified upon release right this way:"
"AWE Tuning says its exhaust for the Silverado ZR2 and Sierra AT4X will feature three-inch tubes with an H-pipe design, along with available four-inch tips in chrome or diamond black. Customers will also be able to order the exhaust system with the company’s ‘BashGuard’ top for added protection when rock crawling and off-roading. The exhaust will be sold with a lifetime warranty, as well.

This exhaust is design to work only on Silverado ZR2 and Sierra AT4X models equipped with the naturally aspirated 6.2L V8 L87 gasoline engine, which is rated at 420 horsepower at 5,600 rpm and 460 pound-feet of torque at 4,100 rpm. Both of these trucks are also offered with the

While this exhaust has yet to officially go on sale, AWE Tuning provides a sneak peek of its deep, defined note in the teaser video embedded below."