GMC Sierra 2500HD Performance Exhaust - Single Exit - Flowmaster - Flow FX Cat-Back - `20-`26
GMC Sierra 2500HD Performance Exhaust - Single Exit - Flowmaster - Flow FX Cat-Back - `20-`26
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GMC Sierra 2500HD Performance Exhaust - Single Exit - Flowmaster - Flow FX Cat-Back - 20-26 is built for 6.6L gas HD trucks. It delivers a deep, composed tone and dependable performance for your daily haul or weekend tow.
Engineered for 2020–2026 GM 2500HD/3500HD (2WD/4WD), this cat-back pairs 3.5-inch mandrel-bent, 16-gauge 409 stainless tubing with a 409 stainless, straight-through Flow FX muffler. It connects to the factory tailpipe, reuses factory hanger points, and includes hardware and instructions for a straightforward install. On the dyno, gains of up to 11 hp and 10 lb-ft at the wheels help sharpen acceleration and towing response, while the tuned design delivers a deep note without interior drone. Backed by Flowmaster’s Lifetime Limited Warranty.
Features
- 2020–2026 GM 2500HD/3500HD 6.6L gas fitment; single-exit cat-back
- 3.5-inch mandrel-bent, 16-gauge 409 stainless steel
- Flowmaster Flow FX straight-through muffler; no-drone interior
- Uses factory hangers; connects to the factory tailpipe
- Includes instructions and all necessary hardware; 2WD/4WD compatible
- Dyno gains up to +11 hp and +10 lb-ft at the rear wheels
Have questions or want expert installation? Call our Austin, Texas or Los Angeles, California area teams. We offer installation and customization at both locations: 512-982-9393 (TX), 562-981-6800 (CA). Considering multiple items? Contact us about shipping discounts. We install on premises at both locations.
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Need Assistance?
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Call us at 512-982-9393 (Austin, TX) or
562-981-6800 (Signal Hill, CA)
and get assistance from one of our sales team members!
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