Flowmaster American Thunder Cat-Back For GM 1500 5.3L (14-19) (817853)

The Flowmaster American Thunder Cat-back exhaust system is a performance upgrade designed to deliver a deep, powerful sound both outside and inside the vehicle. Constructed entirely from stainless steel, it features a single in/dual outlet Super 40 Series muffler and mandrel-bent dual 2.50-inch stainless steel tailpipes, maximizing airflow and sound quality. This emissions-legal system enhances vehicle performance with maximum dyno gains of 21 horsepower and 23 lb.ft. at the rear wheels. The system is finished with large 3.50-inch double wall polished stainless steel tips, providing durability and a polished appearance. It is a bolt-on upgrade that utilizes factory hanger locations and includes all necessary hardware and instructions for easy installation at home.

Designed for 2019-2026 GM 1500 trucks with the 5.3L engine, this system fits both 2WD and 4WD models, including Crew cab and double cab configurations with factory single exhaust. It is compatible with new body style trucks and is suitable for street performance, towing, and daily driving applications. The system offers dual tailpipe exit options—either dual outlets under the bumper or behind the rear wheels—to prevent exhaust blowback when towing boats or trailers. This performance exhaust system is a direct replacement for factory components, providing improved sound and performance without requiring modifications.