“...e Flowmaster® American Thunder® Cat-back exhaust system for the 2020-2026 Chevy Silverado and GMC Sierra 2500HD and 3500HD trucks with the 6.6L gas engine, has a moderat...”
“Fits 2020-2026 Chevy Silverado/GMC Sierra 2500HD/3500HD trucks with 6.6L gas engine...”
Confirm fitment with the part number before ordering.
Product information
Manufacturer information. Check the part number and installation requirements for your vehicle.
Supplier details checked 2026-09-23 · Test catalog
Product description
Fits 2020-2026 GM 2500HD/3500HD with 6.6L gas engine, Crew Cab/Short Bed, Dual Out Rear/Dual Out Side, Polished Tips - Aggressive to moderate sound
Flowmaster American Thunder Cat-back Exhaust System
Features
Uses the Factory Hanger Locations for Easy Installation
Mandrel-bent 16-gauge Tubing for Maximum Exhaust Flow
50 Series HD Muffler with Delta Flow Technology
409 Stainless Steel Construction for Long Life
Multiple Tailpipe Exits Provided in Kit
Increased Performance and Exhaust Flow
Large 3.00-inch Dual Tailpipes
Deep Powerful Exterior Sound
Lifetime Limited Warranty
Flowmaster Quality
Manufacturer notes
Fits 2020-2026 Chevy Silverado/GMC Sierra 2500HD/3500HD trucks with 6.6L gas engine. Crew Cab/6.5ft bed only. Will not fit models with 5th wheel tow hitch installed.
Supplier category
Exhaust, Mufflers & Tips
Supplier subcategory
Catback
UPC / barcode
700042039760
Units per product
1
Supplier Proposition 65 status
Y
Supplier EPA status
N/A
Air freight prohibited
No
Not CARB approved
No
CARB acknowledgement required
Yes
Freight delivery required
No
Powersports product
No
More manufacturer information
Other product descriptions
Flowmaster 20-25 GM 2500HD 6.6L CCB American Thunder Cat-Back Exhaust System
20202025 GM 2500HD 66L CCSB AMT DORS
SYS 2020-2026 GM 250
About the manufacturer
The Flowmaster® American Thunder® Cat-back exhaust system for the 2020-2026 Chevy Silverado and GMC Sierra 2500HD and 3500HD trucks with the 6.6L gas engine, has a moderate to aggressive sound level inside and outside of the truck, with all of the performance benefits you 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 a pair of large 4.00-inch polished 304 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.
Notes: Fits Crew Cab with 6.5' bed length, 159-inch wheelbase only. Will not fit models with 5th wheel tow hitch installed.
Additional manufacturer information
SYS 20-26
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