Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is engineered for truck owners who want a deep, powerful sound outside the vehicle with a little growl inside the cab. Built around the proven Super 40 Series muffler and mandrel-bent dual 2.50-inch stainless steel tailpipes, this bolt-on system transforms both the tone and the performance of your GM 1500 while keeping installation straightforward. It’s an emissions-legal, CARB-compliant upgrade that delivers aggressive-to-moderate sound and real, measurable gains at the rear wheels.
Full stainless steel construction runs the length of the system, pairing a single in/dual outlet Super 40 Series muffler with mandrel-bent dual tailpipes for maximum flow and a rich, deep note. Flowmaster backs the performance with maximum dyno gains of 21 horsepower and 23 lb.-ft. of torque at the rear wheels, so the American Thunder system looks the part, sounds the part, and adds usable power.
Key Benefits
Designed for a perfect fit, the system uses the factory hanger locations for a clean, no-guesswork installation. It arrives complete with installation instructions and all the necessary hardware, making it an easy at-home project for the weekend mechanic. The whole system is finished off with a pair of large 3.50-inch double-wall polished 304 stainless steel tips featuring an embossed logo, adding a premium look that matches the aggressive sound.
Choose Your Tailpipe Exit
Configure the American Thunder system with the exit that suits how you drive. Select dual out the rear, exiting under the bumper for a classic look, or dual out the side behind the rear wheels — a smart choice for towing, helping prevent exhaust from blowing on your boat or trailer while you haul.
- Full stainless steel construction with mandrel-bent dual 2.50-inch stainless steel tailpipes
- Super 40 Series muffler — single inlet (center), dual outlet, 19.50-inch overall length, black finish, muffler included
- Maximum dyno gains of 21 hp and 23 lb.-ft. at the rear wheels
- Large 3.50-inch double-wall polished 304 stainless steel tips with embossed logo
- Uses factory hanger locations; includes installation instructions and all necessary hardware
- Emissions-legal and CARB compliant (Emission Code 5)
Fitment
This cat-back system is built for 2WD and 4WD 2019-2026 GM 1500 trucks (new body style) equipped with the 5.3L engine and factory single exhaust. It fits Crew Cab and Double Cab models. As a direct bolt-on that mounts to the factory hangers, it delivers a precise, purpose-built fit with no fabrication required.
Whether you’re chasing a deeper exhaust note, added rear-wheel power, or a polished set of tips to finish the look of your truck, the Flowmaster American Thunder Cat-back Exhaust System delivers all three in one thoroughly engineered package. Warning: California Proposition 65.
