GMC Sierra 3500HD Performance Exhaust - Flowmaster - American Thunder Cat-Back - `11-`19
GMC Sierra 3500HD Performance Exhaust - Flowmaster - American Thunder Cat-Back - `11-`19

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GMC Sierra 3500HD Performance Exhaust – Flowmaster American Thunder Cat-Back (2011–2019). A bolt-on system that adds a deep, moderate-to-aggressive note for 6.0L gas models.
Built for Crew Cab, Standard Bed (6.5 ft) trucks with the 153.7 in wheelbase, this emissions-legal cat-back features a stainless 50 Series HD muffler with Delta Flow and dual 3.00 in mandrel-bent tailpipes. Choose dual side or dual rear exits with 4.00 in polished tips. It reuses factory hangers, includes all hardware, and carries a Lifetime Limited Warranty. Also fits 2011–2019 Silverado/Sierra 2500HD/3500HD 6.0L Crew Cab, Standard Bed.
Features
- Moderate to aggressive sound
- 50 Series HD muffler with Delta Flow
- Dual 3.00 in mandrel-bent tailpipes
- Side or rear exit with 4.00 in polished tips
- Stainless steel, bolt-on; hardware included
Have fitment questions? Call 512-982-9393 (TX) or 562-981-6800 (CA). We provide installation and customization at our Austin, Texas and Los Angeles, California area locations. 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



