GMC Sierra 2500HD Performance Exhaust - Flowmaster - American Thunder Cat-Back - `11-`19
GMC Sierra 2500HD Performance Exhaust - Flowmaster - American Thunder Cat-Back - `11-`19

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GMC Sierra 2500HD Performance Exhaust – Flowmaster American Thunder Cat-Back (2011–2019). For 6.0L Crew Cab, 6.5 ft bed (153.7 in wheelbase), it provides a moderate to aggressive sound inside and out.
Engineered as an emissions-legal, bolt-on upgrade, this system features a stainless 50 Series HD muffler with Delta Flow technology and large dual 3.00 in mandrel-bent tailpipes. Choose dual side exits or dual straight-out-the-rear, finished with polished 4.00 in stainless tips. It reuses the factory hanger locations for a straightforward install, includes all required hardware, and is backed by Flowmaster’s Lifetime Limited Warranty.
Features
- Fits 2011–2019 GMC Sierra 2500HD, 6.0L, Crew Cab, 6.5 ft bed, 153.7 in WB
- Moderate to aggressive interior/exterior sound
- 50 Series HD muffler with Delta Flow
- Dual 3.00 in mandrel-bent tailpipes
- Polished 4.00 in stainless tips
- Multiple exit configurations included
- Uses factory hangers; hardware included
- Lifetime Limited Warranty
Questions or need guidance? Call us at 512-982-9393 (TX) or 562-981-6800 (CA). We offer installation and customization at our Austin, Texas and Los Angeles, California area locations.
Thinking about 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



