Flowmaster American Thunder Cat-Back for 2019–2026 GMC Sierra 1500 (5.3L, factory single exhaust). This stainless system delivers a deep, powerful tone with an aggressive-to-moderate presence.

Built from full stainless steel with mandrel-bent dual 2.50-inch tailpipes, a single-in/dual-out Super 40 Series muffler, and twin 3.50-inch double-wall polished 304 tips. Emissions-legal and bolt-on, it uses factory hangers and includes hardware and instructions. Choose dual exits straight out the rear under the bumper, or behind the rear wheels to help keep exhaust away from a trailer. Independent testing has shown maximum rear-wheel gains of 21 hp and 23 lb-ft, and the system clears the factory spare.

Features

• Fits 2019–2026 GM Silverado/Sierra 1500 (new body style) 5.3L, 2WD/4WD, single-exit OE
• Excludes 2019 LD/classic, crew cab 2WD with 2-piece driveshaft, Multimatic, or factory dual-exit
• Stainless construction; mandrel-bent dual 2.50-inch tailpipes
• Super 40 Series muffler; deep performance tone
• Rear or behind-wheel exits; factory hangers; twin 3.50-inch polished 304 tips; lifetime limited warranty

Questions or need help choosing the right configuration? Call Austin, TX at 512-982-9393 or our Los Angeles, CA area shop at 562-981-6800. We offer professional installation and customization at both locations.

Buying multiple items? Contact us for potential shipping discounts.

We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov