GMC Sierra 3500 HD Performance Exhaust - Single Side Exit - Flowmaster - Flow FX Cat-Back - Black - `11-`19
GMC Sierra 3500 HD Performance Exhaust - Single Side Exit - Flowmaster - Flow FX Cat-Back - Black - `11-`19

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GMC Sierra 3500 HD Performance Exhaust - Single Side Exit - Flowmaster Flow FX Cat-Back - Black (2011-2019). A proven cat-back that delivers a deep, moderate tone and improved flow for your 6.0L HD.
Built with 3.5-inch mandrel-bent 16-gauge 409 stainless steel and a straight-through Flow FX muffler, this system reduces restriction and adds a refined performance note. It exits behind the rear wheel with a 5-inch black ceramic-coated tip, uses factory hanger locations, and includes hardware and instructions for an at-home install. Designed for 2011-2019 GM Silverado/Sierra 2500/3500 HD 6.0L V8 Crew Cab with 6.5' bed. Dyno testing showed gains of up to +21 hp and +23 lb-ft at the rear wheels. Backed by Flowmaster’s Lifetime Limited Warranty.
Features
- 3.5" mandrel-bent 409 stainless steel tubing
- Flow FX straight-through muffler; deep, moderate tone
- Single side exit behind rear wheel
- 5" black ceramic-coated tip
- Factory-style hangers; complete hardware
- Fits 2011-2019 6.0L Crew Cab 6.5' bed (2500/3500 HD)
Questions or need guidance on your build? Call our Austin, TX shop at 512-982-9393 or our Los Angeles, CA area shop at 562-981-6800. We offer installation and customization services at both locations.
Buying multiple items? Contact us for possible shipping discounts. We install on premises at both locations.
CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov








