Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is engineered for owners of the 2019-2026 GM 1500 (new body style) trucks with the 5.3L engine who want an aggressive exterior sound with a moderate, livable interior tone. This emissions-legal bolt-on system delivers the performance benefits you expect from Flowmaster while transforming the look and voice of your Silverado 1500 or Sierra 1500. With maximum dyno gains of 15 hp and 19 lb-ft at the rear wheels, it wakes up the 5.3L without droning inside the cab.
Sound & Performance
At the heart of the system is the proven Super 40 Series muffler, tuned to produce that signature American Thunder growl outside the truck while keeping the interior tone moderate for daily driving. Mandrel-bent 3.00-inch stainless steel tubing and a flex joint promote smooth, high-volume flow, feeding into dual 2.50-inch mandrel-bent stainless tailpipes for balanced backpressure and consistent power delivery.
Style That Finishes the Look
The system is capped with quad 4.00-inch black ceramic coated stainless steel tips that exit cleanly out under the factory exhaust bezels for an integrated, purposeful appearance. The silver mandrel-bent tubing and blacked-out tips give the truck a bold, aggressive stance without any cutting or fabrication.
Key Highlights
- Super 40 Series muffler included for an aggressive exterior sound with a moderate interior tone
- Mandrel-bent 3.00-inch stainless steel tubing with a flex joint for durable, high-flow performance
- Dual 2.50-inch mandrel-bent stainless tailpipes with quad 4.00-inch black ceramic coated stainless tips
- Tips exit under the factory exhaust bezels for a clean, integrated look
- Maximum dyno gains of 15 hp and 19 lb-ft at the rear wheels
- CARB (California) compliant and emissions-legal (Emission Code 5)
Fitment
This American Thunder cat-back is designed to fit 2019-2026 Chevrolet Silverado 1500 and GMC Sierra 1500 Crew Cab and Double Cab models equipped with the 5.3L engine. It is built for trucks with 5.5 and 6.5-ft long beds that have the factory dual exhaust option. The system uses the factory hangers for a precise, no-guesswork mount.
Easy At-Home Installation
Designed for an easy fit, this bolt-on system includes all necessary parts and hardware for an easy at-home installation. Because it mounts to the factory hangers, you can upgrade your truck’s sound, style, and performance in your own garage without specialized fabrication. From the mandrel-bent stainless tubing to the black ceramic coated quad tips, every component is built to Flowmaster standards for lasting durability and confident daily driving.
Warning: This product carries a California Proposition 65 warning.
