Flowmaster American Thunder Cat-back Exhaust System
Part # 817933
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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
Estimated Ship Date: 07/31/2026
Free Shipping - Lower 48 US States
Advertised Price $1,075.95
$967.95
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Emissions
This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.
See Emissions DetailsThe 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.
Features:
- 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 |
|---|---|
| California Proposition 65 | Yes |
| CARB (California) Compliant | Yes |
| Catalytic Converter Included | No |
| Catalytic Converter Quantity | 0 |
| Category | Exhaust |
| Clamping Type | Flat Band |
| Clamps Included | Yes |
| Emission Code | 5 |
| Exhaust Series | American Thunder |
| Exhaust Tip Color | Silver |
| Exhaust Tip Connection | Clamp-On |
| Exhaust Tip Cut | Angled |
| Exhaust Tip Diameter | 4.00 IN |
| Exhaust Tip Edge | Angle Cut |
| Exhaust Tip Finish | Polished |
| Exhaust Tip Intercooled | No |
| Exhaust Tip Length | 13.00 IN |
| Exhaust Tip Material | 304 Stainless Steel |
| Exhaust Tip Quantity | 2 |
| Exhaust Tip Resonated | No |
| Exhaust Tip Shape | Round |
| Exhaust Tip Wall | Double Wall |
| Exit Style | Dual Out Rear |
| Dual Out Side | |
| Finish | Natural |
| Gasket Or Seal Included | No |
| Grade Type | Performance |
| Hangers Included | Yes |
| Heat Shield Included | No |
| Inlet Type | Flanged |
| Main Piping Diameter | 3.00 IN |
| Mount Type | Uses factory hangers |
| Mounting Bracket Included | Yes |
| Muffler Body Height | 5.00 IN |
| Muffler Body Length | 18.00 IN |
| Muffler Body Material | 409 Stainless Steel |
| Muffler Body Shape | Oval |
| Muffler Body Width | 10.00 IN |
| Muffler Color | Black |
| Muffler Finish | Black High-Temperature Paint Finish |
| Muffler Flanged Inlet | No |
| Muffler Flanged Outlet | No |
| Muffler Included | Yes |
| Muffler Inlet Connection | Slip-Fit |
| Muffler Inlet Inside Diameter | 3.50 IN |
| Muffler Inlet Location | Center |
| Muffler Inlet Outside Diameter | 3.63 IN |
| Muffler Outlet Connection | Slip-Fit |
| Muffler Outlet Diameter | 3.00 IN |
| Muffler Outlet Location | Dual |
| Muffler Outlet Quantity | 2 |
| Muffler Overall Length | 24.00 IN |
| Muffler Part Number | Kit Only |
| Muffler Quantity | 1 |
| Muffler Series | 50 Series HD |
| Muffler Type | Reflection |
| part type | Exhaust System |
| Pipe Color | Silver |
| Pipe Material | 409 Stainless Steel |
| Product Type | Exhaust System |
| Sound Level | Aggressive / Moderate |
| Spring Bolt Kit Included | No |
| Sub Category | Exhaust and Tail Pipes |
| Tail Pipe Outlet Outside Diameter | 3.00 IN |
| Tail Pipe Quantity | 2 |
| Dual | |
| Tail Pipe Tapered Outlet | No |
| Tip Logo | Embossed |
| Type | Cat-Back |
| Valve Included | No |
| Valve Type | Not Applicable |
| UPC | 700042039760 |
| California Proposition 65 Chemical Name | Chromium (hexavalent compounds) |
| Nickel (Metallic) | |
| Part Number | 817933 |
![Flowmaster Exhaust Tip]()
Exhaust Tip - 4.00 in. Angle Cut Polished SS Fits 3.00 in. Tubing - Clamp on$104.35Qty:
5
This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.
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Some parts are not legal for use in California or other states with similar regulations.