GMC Sierra 3500HD Performance Exhaust - Rear - Flowmaster - American Thunder Cat-Back - Polished - `01-`07
GMC Sierra 3500HD Performance Exhaust - Rear - Flowmaster - American Thunder Cat-Back - Polished - `01-`07

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GMC Sierra 3500HD Performance Exhaust – Flowmaster American Thunder Cat-Back (Polished), 2001–2007 Classic. A rear-exit, bolt-on upgrade with a deep, confident tone.
Designed for 6.0L or 8.1L models with the factory dual-inlet muffler layout, this system connects after the catalytic converters and uses a 50 Series Big Block muffler for a moderate interior note and powerful exterior sound. A mandrel-bent 3.5 in. aluminized steel tailpipe exits behind the right rear wheel—towing friendly—and ends with a 4 in. polished 304 stainless tip stamped with the Flowmaster logo. Includes a formed aluminum heat shield with stainless clamps, factory-location hangers, hardware, and instructions for an easy fit. Backed by a 3-year limited warranty.
Features
- Fits 2001–2006 (2007 Classic) GMC Sierra 3500HD, 6.0L/8.1L
- American Thunder: moderate inside, deep outside
- 50 Series Big Block muffler; dyno-tuned
- 3.5 in. mandrel-bent aluminized tailpipe
- 4 in. polished 304 stainless tip
- Uses factory hangers; hardware included
Questions or need expert guidance? Call us. We offer installation and customization at our Austin, Texas and Los Angeles, California locations: TX 512-982-9393, CA 562-981-6800.
Buying 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





