Our brand-new American Thunder Cat-back exhaust system by Flowmaster will make your brand new 2020 Chevy Silverado / GMC Sierra 2500HD and 3500HD with a 6.6L Gas engine sound like the real beast.

The Flowmaster® American Thunder® Cat-back exhaust system designed for the 6.6L Gas engines will add that moderate to aggressive sound level inside and outside of the truck to enhance your driving experience. The tailpipes on this cat-back can be easily configured to exit either dual straight out the back, or dual out the sides behind the rear wheels, which is perfect for any tow rig.

Flowmaster - American Thunder Cat-Back Exhaust System


2020 Chevy Silverado 2500HD / 3500HD
2020 GMC Sierra 2500HD / 3500HD


Fits Crew Cab with 6.5' bed length, 153.7-inch wheelbase only.


  • Mandrel-bent 16 Gauge Tubing for Maximum Exhaust Flow
  • Uses the Factory Hanger Locations for Easy Installation
  • 50 Series HD Muffler with Delta Flow Technology
  • 409 Stainless Steel Construction for Long Life
  • Increased Performance and Exhaust Flow
  • Multiple Tailpipe Exits Provided in Kit
  • Large 3.00-inch Dual Tailpipes
  • Deep Powerful Exterior Sound
  • Lifetime Limited Warranty
  • Flowmaster Quality

Lookup here for more details about the new Flowmaster release.