Flowmaster  American Thunder Cat Back Exhaust System 817933
Flowmaster  American Thunder Cat Back Exhaust System 817933
Flowmaster  American Thunder Cat Back Exhaust System 817933

Flowmaster American Thunder Cat Back Exhaust System 817933

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Compatible with 2020 GM 2500HD 6.6L gas engine trucks. Not created or sold by General Motors. The Flowmaster American Thunder Cat-back exhaust system for the 2020 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks with the 6.6L gas engine, is perfect if you are looking for a moderate to aggressive sound level inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster. Designed for the Crew Cab, Standard Bed (6.5 ft.) models only, this bolt-on, emissions-legal system features a stainless steel 50 Series HD muffler and large dual 3.00-inch 409 stainless steel mandrel-bent tailpipes that can be configured to exit either dual straight out the back, or dual out the sides behind the rear wheels which is best suited for towing applications. The system is finished off with polished 4.00-inch stainless steel tips and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.


  • 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


Brand Flowmaster
Catalytic Converter Format No
Emission Code 5
Exhaust Series American Thunder
Exit Position Dual Out Rear / Dual Out Side
Heat Shield No
Mount Type Uses Factory Hangers
Muffler Body Length (in) 18
Muffler Color Black
Muffler Finish Painted
Muffler Inlet Diameter 3.00
Muffler Inlet Location Centered
Muffler Material 409S Stainless Steel
Muffler Outlet Diameter 3.00
Muffler Outlet Location Dual Outlet
Muffler Overall Length (in) 24
Muffler Part Number Kit Only
Muffler Series 50 Series HD
Muffler Shape Oval
Muffler Type Reflection
Product Type Cat-Back Exhaust Kit
Single Dual Dual
Sound Level Moderate/Aggressive
System Type Cat-back
Tip Cut Angle
Tip Diameter 4.00
Tip Edge Style Cut
Tip Finish Polished
Tip Length 13
Tip Logo Embossed
Tip Material 304 Stainless
Tip Quantity 2.00
Tip Shape Round
Tip Style Double Wall
Tubing Diameter (in) 3.00
Tubing Material 409S Stainless Steel
Part Number 817933
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