Description
Overview
The Flowmaster Outlaw Cat-Back Exhaust System is engineered for drivers who want their truck to announce its presence. Built for the 2020–2026 Chevy Silverado and GMC Sierra 2500HD/3500HD equipped with the 6.6L gas engine, this bolt-on system delivers the aggressive sound level and proven performance you expect from Flowmaster — both inside the cab and out on the open road. It’s a complete, emissions-legal upgrade that replaces the restrictive factory exhaust with mandrel-bent flow and the unmistakable Outlaw series attitude.
Performance & Sound
At the heart of the system is a stainless steel Outlaw series 10 Series muffler with a 3.50-inch center inlet and dual 3.00-inch outlets, tuned to produce a bold, aggressive tone. Flowmaster rates maximum increases of up to 9 horsepower and 9 lb-ft over stock at the rear wheels, so you gain real, measurable performance along with the added presence. The muffler measures 12.375 inches overall and wears a durable black finish, while the piping carries a clean silver look under the truck.
Configurable Dual Tailpipe Options
Large dual 3.00-inch 409 stainless steel mandrel-bent tailpipes give you flexibility in how the system exits. Configure it to run dual straight out the back for a traditional, aggressive look, or route it dual out the sides behind the rear wheels — an ideal setup for towing applications where clearance at the rear matters. The system is finished with polished 4.00-inch stainless steel tips featuring an embossed Flowmaster logo for a premium, unmistakable appearance.
Key Highlights
- Stainless steel Outlaw series 10 Series muffler included, tuned for an aggressive sound
- Dual 3.00-inch 409 stainless steel mandrel-bent tailpipes with 3.50-inch inlet
- Selectable exit — dual straight rear or dual side-exit for towing
- Polished 4.00-inch stainless steel tips with embossed logo
- Uses factory hangers for a true bolt-on installation
- CARB (California) compliant, emissions-legal design
Fitment
This system is designed specifically for the 2020–2026 Silverado and Sierra 2500HD/3500HD Crew Cab, Standard Bed (6.5 ft.) models with the 6.6L gas engine. It mounts using the factory hangers and includes all necessary parts and hardware for a straightforward, easy fit. Because it is engineered as a direct bolt-on, you won’t need to fabricate or modify to get everything hung correctly.
Confidence in Every Mile
Every component is built from corrosion-resistant stainless steel and backed by Flowmaster’s Lifetime Limited Warranty, so you can install with confidence knowing this exhaust is made to last. Please note this product carries a California Proposition 65 warning. Choose the tailpipe configuration that best fits how you drive and tow, and give your heavy-duty truck the aggressive voice and performance the Outlaw series is known for.
