GMC Sierra 2500HD Performance Exhaust - Flowmaster - American Thunder Cat-Back - `20-`26
GMC Sierra 2500HD Performance Exhaust - Flowmaster - American Thunder Cat-Back - `20-`26

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GMC Sierra 2500HD Performance Exhaust – Flowmaster American Thunder Cat-Back (2020–2026). A bolt-on upgrade for 6.6L gas Crew Cab, 6.5 ft bed trucks with a deep, moderate-to-aggressive tone.
This emissions-legal kit uses a stainless 50 Series HD muffler and dual 3.00-inch 409 mandrel-bent tailpipes. Configure dual rear or dual side exits behind the wheels, ideal for towing. Large 4.00-inch polished 304 tips, factory-hanger mounting, and all hardware make install straightforward. Lifetime Limited Warranty. Fitment: 2020–2026 GMC Sierra/Chevy Silverado 2500HD/3500HD 6.6L gas, Crew Cab 6.5 ft bed (159 in wheelbase). Not for trucks with a 5th wheel hitch.
Features
- 50 Series HD muffler with Delta Flow
- Dual 3.00 in 409 stainless tailpipes
- Dual rear or dual side exits
- Polished 4.00 in 304 stainless tips
- Uses factory hangers; hardware included
Questions or ready to schedule? Call our team, or visit us for installation and customization at our Austin, Texas or Los Angeles, California area shops: 512-982-9393 (TX) or 562-981-6800 (CA).
Buying multiple items? Contact us for shipping discounts. We install on premises at both locations.
CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov






