This Force II® cat-back exhaust system is for 2011-2015 GM 2500HD/3500HD extended cab/short bed trucks with the 6.0L gas engine, and is perfect for the person looking for mild to moderate sound levels with all of the performance benefits that you would expect from Flowmaster®. This bolt-on emissions legal system features a 50 Series Big Block™ muffler, mandrel-bent 3.50-inch stainless steel tubing, a polished 4.00-inch stainless steel tip embossed with the Flowmaster logo. The system is covered by Flowmaster's Lifetime Limited Warranty and includes all necessary parts, hardware and instructions for an easy installation you can do at home.