Flowmaster American Thunder Exhaust for Silverado 1500/Sierra 1500 | FLO238922
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- Have a different car? See all Flowmaster American Thunder Cat-Back Exhausts
- Mild interior drone and aggressive exterior tone
- Catalog Number: Flowmaster 817891
- Fits: Chevrolet Silverado 1500, GMC Sierra 1500 (check fitment chart for compatibility)
Flowmaster American Thunder Cat-Back Exhaust | 817891
Product Specifications:
- Sound Level: Aggressive/ Moderate
- Type: Cat-Back
- Exhaust Type: Single
- Outlet Type: Quad
- Exit Position: Split Rear Exit
- Material: Stainless Steel
- Diameter (IN): 3-1/2 Inch
- Includes Muffler: Yes
- Muffler Brand: 50 Series HD
- Includes Exhaust Tip: Yes
- Exhaust Tip Style: 4 Inch Round Angle-Cut
- Exhaust Tip Material: Stainless Steel
- Muffler Quantity: 1
- Includes Exhaust Pipe Muffler Delete: No
- Muffler Configuration: Single Inlet, Dual Outlet
- Includes Hardware: Yes
- Required Welding: No
- Estimated Install Time (Hours): 2
Fitment Chart:
| Years | Make | Model | Submodel | Body Type | Bed Length | Liters | Cylinders | Notes |
|---|---|---|---|---|---|---|---|---|
| 2019-2020 | Chevrolet | Silverado 1500 | High Country | Crew Cab Pickup | 5' 9" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019-2020 | Chevrolet | Silverado 1500 | High Country | Crew Cab Pickup | 6' 7" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019-2020 | GMC | Sierra 1500 | AT4 | Crew Cab Pickup | 5' 9" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019-2020 | GMC | Sierra 1500 | AT4 | Crew Cab Pickup | 6' 7" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019-2020 | GMC | Sierra 1500 | Denali | Crew Cab Pickup | 5' 9" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019-2020 | GMC | Sierra 1500 | Denali | Crew Cab Pickup | 6' 7" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019-2020 | GMC | Sierra 1500 | SLT | Crew Cab Pickup | 5' 9" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019-2020 | GMC | Sierra 1500 | SLT | Crew Cab Pickup | 6' 7" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019 | Chevrolet | Silverado 1500 | LTZ | Crew Cab Pickup | 5' 9" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019 | Chevrolet | Silverado 1500 | LTZ | Crew Cab Pickup | 6' 7" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019 | Chevrolet | Silverado 1500 | LTZ | Extended Cab Pickup | 5' 9" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019 | Chevrolet | Silverado 1500 | LTZ | Extended Cab Pickup | 6' 7" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019 | GMC | Sierra 1500 | AT4 | Extended Cab Pickup | 5' 9" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019 | GMC | Sierra 1500 | AT4 | Extended Cab Pickup | 6' 7" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019 | GMC | Sierra 1500 | SLT | Extended Cab Pickup | 5' 9" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
| 2019 | GMC | Sierra 1500 | SLT | Extended Cab Pickup | 6' 7" Foot Bed | 6.2L | V8 | Dual Out Rear Exit; Incl. 2.5 in. Tubing/Straight Through Mufflers/Round Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant |
Chevrolet Silverado 1500 exhaust system
The Flowmaster 817891 American Thunder exhaust system delivers exceptional performance for a reasonable price. It is assembled with the best quality parts, each individually crafted and handpicked for the ultimate exhaust flow.
Aggressive tone muffler
The exhaust system includes a 44 series Flowmaster muffler. It is louder than most stock mufflers with a mild interior drone and aggressive exterior tone. It is made of premium grade stainless steel for superb strength and excellent performance.
Optimal Chevrolet Silverado 1500 performance
The manufacturer has tested the exhaust system on the dyno and proved its quality, performance, and adherence to industrial standards.
Undeterred exhaust flow
The Flowmaster 817891 American Thunder exhaust system also features a mandrel-bent tubing. This allows the exhaust gases to flow smoothly without any deterrence.
Easy bolt-on fitment
The exhaust system is easy to install. It has factory mounting points for a full bolt-on installation. The purchase includes all installation hardware including clamps and bolts. It is advisable to have a professional do the job for the best error-free fitment.
Made strong to last long on your Chevrolet Silverado 1500
The Flowmaster 817891 American Thunder exhaust system components are made with high-grade steel. It is strong and virtually indestructible. It will withstand years of use to maintain its strength and value.
Limited lifetime warranty
Flowmaster offers a limited lifetime warranty to the stainless steel exhaust systems. A 3-year warranty applies to the aluminized steel exhaust systems. This is a guarantee of superior quality and expert crafting.
Proudly made in the USA
True to its name, the Flowmaster 817891 American Thunder is proudly made in the USA. Expert crafters manufacture each part form the finest and most authentic steel in the industry. The company also creates jobs for thousands of Americans every year and uses locally made materials.