Flowmaster 817933 American Thunder Cat-Back Exhaust System Chevrolet Silverado/GMC Sierra 2500/3500 AT4/AT4X/ZR2 20-26

Flowmaster American Thunder Cat-Back Exhaust System

The Flowmaster American Thunder Cat-Back Exhaust System is designed for 2020–2026 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD trucks equipped with the 6.6L gas engine. It delivers a moderate-to-aggressive sound inside and outside the truck, along with improved performance and exhaust flow.

This emissions-legal, bolt-on system features a stainless steel 50 Series HD muffler with Delta Flow technology and large, dual 3.00-inch 409 stainless steel mandrel-bent tailpipes. The tailpipes can be configured for dual straight-out-the-back exits or dual side exits behind the rear wheels, with the side-exit configuration particularly suited for towing applications.

The system is finished with a pair of large 4.00-inch polished 304 stainless steel tips. It uses the factory hanger locations and includes all necessary components and hardware for installation. The exhaust system is backed by a Lifetime Limited Warranty.

Features

• Mandrel-bent 16-gauge tubing for maximum exhaust flow
• Factory hanger locations for easy installation
• 50 Series HD muffler with Delta Flow technology
• 409 stainless steel construction for long service life
• Improved performance and exhaust flow
• Dual rear-exit and dual side-exit tailpipe configurations included
• Large 3.00-inch dual tailpipes
• Deep, powerful exterior sound
• Large 4.00-inch polished 304 stainless steel tips
• Lifetime Limited Warranty

*Fits Crew Cab models with a 6.5-foot bed and 159-inch wheelbase only. Will not fit models with a 5th-wheel tow hitch installed.

Compatibility / Fitment

• Vehicle Makes: Chevrolet, GMC
• Vehicle Models: Silverado 2500HD, Silverado 3500HD, Sierra 2500HD, Sierra 3500HD
• Model Years: 2020–2026
• Engine: 6.6L gas engine
• Cab Configuration: Crew Cab
• Bed Configuration: Short Bed / Standard Bed
• Bed Length: 6.5 feet
• Wheelbase: 159 inches
• Exhaust Outlet Configuration: Dual straight-out-the-back or dual side exits behind the rear wheels
• Tip Finish: Polished
• Sound Level: Moderate to aggressive
• Exclusion: Does not fit models with a 5th-wheel tow hitch installed

Flowmaster 817933 American Thunder Cat-Back Exhaust System Chevrolet Silverado/GMC Sierra 2500/3500 AT4/AT4X/ZR2 20-26 - Features