The new Flowmaster American Thunder® Cat-back exhaust system for 2011-2019 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks with 6.0L, is perfect for the person looking for a moderate to aggressive sound level inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster®. Designed for the Crew Cab, Standard Bed (6.5 ft.) models only, this bolt-on, emissions-legal system features a stainless steel 50 Series HD™ muffler and large dual 3.00 in. stainless steel mandrel bent tailpipes that can be configured to exit either dual out the sides, or dual straight out the back. The system is finished off with beautifully polished 4.00 in. stainless steel tips and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation. Notes: Fits Crew Cab with 6.5' bed length. 153.7 in. wheelbase only.