Check out DynoMax's stainless steel cat-back exhaust system (Part number: 39511) for 2011 Chevrolet Silverado/GMC Sierra 2500HD/3500HD powered by the 6.0-liter engine.
The Cat-back Exhaust kit uses an the DynoMax Ultra Flo welded muffler -- an unrestricted, straight-through design proven to flow up to 2,000 SCFM and support up to 2,000 horsepower. The also features stainless steel buffed and polished slat cut tip with 4-inch inlet, 5-inch outlet, and 18-inch OAL with rolled edges with 4-inch mandrel bent stainless steel tubing. Four stainless steel 4-inch band clamps and clamp rod hanger are also included.
Extension pipes to fit 133.7-inch, 144.2-inch, 153.7-inch, 158.2-inch and 167.7-inch wheel bases are available and my take some custom cutting to fit. Contact dealers to find out more.
Backed by a 90-day performance and sound guarantee.