Upgrade your 2022-2026 Toyota Tundra with the Flowmaster Outlaw cat-back exhaust system, part number 818139. Designed for Tundra trucks equipped with the 3.4-liter engine, including hybrid models, this system improves exhaust flow, delivers a more aggressive exterior tone, and maintains minimal interior resonance for comfortable driving. The system is engineered as a direct-fit replacement using the truck’s existing factory hanger locations, making installation suitable for experienced do-it-yourself enthusiasts.
Constructed from durable 409 stainless steel tubing, the Flowmaster 818139 exhaust system uses mandrel-bent tubing to promote smoother exhaust gas flow and consistent performance. Its specially tuned Outlaw muffler is designed to enhance sound and throttle response while retaining a controlled cabin experience. Dyno testing showed gains of up to 10 horsepower and 14 lb-ft of torque at the rear wheels compared with the stock exhaust system, helping your Tundra perform with greater efficiency and authority.
This versatile system includes dual 3.5-inch black ceramic-coated exhaust tips and supports either a dual rear exit or dual side exit configuration, giving you two installation options in one kit. All necessary hardware and installation instructions are included for a straightforward setup. The Flowmaster Outlaw cat-back system is backed by Flowmaster’s Lifetime Limited Warranty. Professional installation is recommended, and applicable emissions requirements should be reviewed before installation.
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