GMC Sierra 2500HD Performance Exhaust - Rear - Flowmaster - Outlaw Cat-Back - `20-`26
GMC Sierra 2500HD Performance Exhaust - Rear - Flowmaster - Outlaw Cat-Back - `20-`26

Available Options
Drive now, Pay later with Affirm
or with PayPal
Both options will be available upon checkout.

GMC Sierra 2500HD Performance Exhaust – Rear – Flowmaster Outlaw Cat-Back (2020–2026) for 6.6L gas trucks with an aggressive tone and improved flow.
Designed for Crew Cab, Standard Bed (6.5 ft), 159 in wheelbase models, this emissions-legal kit uses mandrel-bent 16‑ga 409 stainless: 3.50 in inlet to dual 3.00 in tails. Choose dual rear or side exits, well-suited for towing. An Outlaw muffler delivers a deep, aggressive note, finished with dual polished 4.00 in tips. Includes hardware and factory-style hangers. Verified gains up to 9 hp and 9 lb‑ft at the wheels. Will not fit 5th wheel hitch trucks.
Features
- 2020–2026 Sierra 2500HD/3500HD 6.6L gas fitment
- 3.50 in to dual 3.00 in 409 stainless tubing
- Dual rear or dual side exit configuration
- Polished dual 4.00 in tips; Lifetime Limited Warranty
Questions or need guidance? Call us. We offer installation and customization at our Austin, Texas and Los Angeles, California area shops: 512-982-9393 (TX), 562-981-6800 (CA).
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








