Upgrade your 2020-2026 Chevrolet Silverado or GMC Sierra 2500HD/3500HD with the Flowmaster Outlaw Cat-Back Exhaust System, part number 818112. Designed for 6.6L gas V8 Crew Cab trucks with the 6.5-foot standard bed and 159-inch wheelbase, this emissions-legal system delivers an aggressive exhaust note inside and outside the vehicle while improving exhaust flow. Testing shows maximum gains of up to 9 horsepower and 9 lb.-ft. of torque over the stock exhaust at the rear wheels.
Built for durability and performance, the system uses 3.50-inch and dual 3.00-inch 16-gauge 409 stainless steel mandrel-bent tubing. The included Outlaw/Super 10 Series performance muffler produces a deep, aggressive tone and supports efficient exhaust flow. Dual 4.00-inch polished stainless steel tips provide a clean, custom appearance, while the tailpipes can be configured for a straight rear exit or side exit behind the rear wheels. The side-exit configuration is especially well suited for towing applications.
The Flowmaster 818112 is engineered as a bolt-on installation using factory-style hangers in the stock locations and includes the necessary hardware for installation. It is intended only for Crew Cab, standard-bed models and will not fit trucks equipped with an installed fifth-wheel tow hitch. Flowmaster backs this exhaust system with a Lifetime Limited Warranty. Review vehicle fitment and applicable emissions requirements before installation.
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