• FLO817891.jpg
  • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
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  • 817891_021959.jpg
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    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817891
    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817891
    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817891
    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817891
    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817891
    • FLO817891.jpg
    • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2019-2023 Silverado/Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • 817891_031959.jpg
    • 817891_011959.jpg
    • 817891_021959.jpg
    • 817891_041959.jpg
    • 817891_051959.jpg
    • 817891_dyno1959.jpg
    • aggressivemoderatesoundlevel.jpg
    • 817891_031959.jpg
    • 817891_011959.jpg
    • 817891_021959.jpg
    • 817891_041959.jpg
    • 817891_051959.jpg
    • 817891_dyno1959.jpg
    • aggressivemoderatesoundlevel.jpg
    Sale!

    Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817891

    Vendor: Flowmaster
    Part Number: 817891
    Save $157
    $1,249.95 $1,406.95

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
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    Product DetailsFAQReviewsRelated Products
    This Flowmaster American Thunder® cat-back dual exhaust system for the 2019-2023 GM Silverado/Sierra 1500 (new body style) trucks with the 6.2L engine and factory dual exhaust, is perfect for the person looking for an aggressive sound level outside the truck, with a moderate interior tone and all the performance benefits you would expect from Flowmaster®. This emissions-legal bolt-on system fits all 6.2L Crew Cab with 5.5-ft and 6.5-ft beds, and all Double Cab with a 6.5-ft bed and factory dual exhaust tailpipes. Features include a mandrel-bent 3.50-inch stainless steel inlet tube flowing into a single 50 Series HD™ muffler, dual 2.50-inch mandrel-bent stainless tailpipes replacing the factory resonators and giving your truck some growl. The tailpipes are finished off with quad 4.00-inch black ceramic coated stainless steel tips that exit in place of the factory bolt-on exhaust bezels giving your truck an aggressive performance style and setting your truck apart from others, sending the message that you would rather lead than follow. Designed for an easy fit, this system includes all necessary parts, detailed instructions and hardware for an easy at home installation. Notes: Fits 147-inch and 157-inch wheelbases with 6.2L engine and factory dual tailpipes. Only fits models with factory bumper cutouts.


    Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817891


    Specifications:

    Brand Flowmaster
    California Proposition 65 Yes
    California Proposition 65 Chemical Name Nickel (Metallic)
    California Proposition 65 Chemical Name Chromium (hexavalent compounds)
    CARB (California) Compliant Yes
    Catalytic Converter Included No
    2874 0
    Category Exhaust
    3728 Flat Band
    1882 Yes
    Emission Code 5
    Exhaust Series American Thunder
    11205 Black
    9874 Welded
    9876 Angled
    1162 4.00
    9877 Angle Cut
    1163 Black Ceramic Coating
    9881 No
    10104 7.50
    1164 304 Stainless Steel
    1161 4
    9878 No
    10980 Round
    9875 Single Wall
    9870 Dual Out Rear
    200 Natural
    353 No
    3390 Performance
    4364 Yes
    596 Clamp-On
    9871 2.50
    Mount Type Uses Factory Hangers
    92 No
    9884 5.00
    1892 18.00
    4372 409 Stainless Steel
    4373 Oval
    9882 Black High-Temperature Paint Finish
    4367 No
    4368 No
    Muffler Included Yes
    9962 Slip-Fit
    4365 3.50
    4366 3.63
    9963 Slip-Fit
    4375 2
    4374 1
    Muffler Series 50 Series HD
    1174 Chambered
    part type Exhaust System
    3530 409 Stainless Steel
    Product Type Exhaust System
    Sound Level Aggressive / Moderate
    4377 No
    Sub Category Exhaust and Tail Pipes
    4369 2.50
    4376 2
    Tail Pipe Quantity Dual
    4370 No
    26 Cat-Back
    6014 No
    2126 Not Applicable
    Warning California Proposition 65
    Pipe Color Silver
    9885 10.00
    Brand Flowmaster
    California Proposition 65 Yes
    California Proposition 65 Chemical Name Nickel (Metallic)
    California Proposition 65 Chemical Name Chromium (hexavalent compounds)
    CARB (California) Compliant Yes
    Catalytic Converter Included No
    2874 0
    Category Exhaust
    3728 Flat Band
    1882 Yes
    Emission Code 5
    Exhaust Series American Thunder
    11205 Black
    9874 Welded
    9876 Angled
    1162 4.00
    9877 Angle Cut
    1163 Black Ceramic Coating
    9881 No
    10104 7.50
    1164 304 Stainless Steel
    1161 4
    9878 No
    10980 Round
    9875 Single Wall
    9870 Dual Out Rear
    200 Natural
    353 No
    3390 Performance
    4364 Yes
    596 Clamp-On
    9871 2.50
    Mount Type Uses Factory Hangers
    92 No
    9884 5.00
    1892 18.00
    4372 409 Stainless Steel
    4373 Oval
    9882 Black High-Temperature Paint Finish
    4367 No
    4368 No
    Muffler Included Yes
    9962 Slip-Fit
    4365 3.50
    4366 3.63
    9963 Slip-Fit
    4375 2
    4374 1
    Muffler Series 50 Series HD
    1174 Chambered
    part type Exhaust System
    3530 409 Stainless Steel
    Product Type Exhaust System
    Sound Level Aggressive / Moderate
    4377 No
    Sub Category Exhaust and Tail Pipes
    4369 2.50
    4376 2
    Tail Pipe Quantity Dual
    4370 No
    26 Cat-Back
    6014 No
    2126 Not Applicable
    Warning California Proposition 65
    Pipe Color Silver
    9885 10.00
    Description_ABR SYS 19-23 GM
    Description_SHO SYS 19-23 GM 1500, 6
    Description_INV 19-23 GM 1500, 6.2L, AMT, CB, DUAL EXIT
    Description_ASC Fits 2019-2023 Chevrolet Silverado 1500 and GMC Sierra 1500 Crew Cab and Double Cab models with 6.2L engine. Does not fit models with the Multimatic suspension option.
    Description_DES Flowmaster American Thunder Cat-back Exhaust System
    Description_EXT Fits 2019-2023 Chevrolet Silverado, GMC Sierra 1500 with 6.2L engine. - Aggressive to moderate sound
    Description_MKT This Flowmaster American Thunder® cat-back dual exhaust system for the 2019-2023 GM Silverado/Sierra 1500 (new body style) trucks with the 6.2L engine and factory dual exhaust, is perfect for the person looking for an aggressive sound level outside the truck, with a moderate interior tone and all the performance benefits you would expect from Flowmaster®. This emissions-legal bolt-on system fits all 6.2L Crew Cab with 5.5-ft and 6.5-ft beds, and all Double Cab with a 6.5-ft bed and factory dual exhaust tailpipes. Features include a mandrel-bent 3.50-inch stainless steel inlet tube flowing into a single 50 Series HD™ muffler, dual 2.50-inch mandrel-bent stainless tailpipes replacing the factory resonators and giving your truck some growl. The tailpipes are finished off with quad 4.00-inch black ceramic coated stainless steel tips that exit in place of the factory bolt-on exhaust bezels giving your truck an aggressive performance style and setting your truck apart from others, sending the message that you would rather lead than follow. Designed for an easy fit, this system includes all necessary parts, detailed instructions and hardware for an easy at home installation. Notes: Fits 147-inch and 157-inch wheelbases with 6.2L engine and factory dual tailpipes. Only fits models with factory bumper cutouts.
    Description_FAB Large 4.00-inch Black Ceramic Coated Tips
    Description_FAB Removes Factory Resonators in Tailpipes
    Description_FAB Large 50 Series HD Performance Muffler
    Description_FAB Moderately Aggressive Exterior Tone
    Description_FAB Black Ceramic Coated Quad Tips
    Description_FAB Full Stainless Steel Construction
    Description_FAB Uses Factory Hanger Locations
    Description_FAB Lifetime Limited Warranty
    Description_ABR SYS 19-23 GM
    Description_SHO SYS 19-23 GM 1500, 6
    Description_INV 19-23 GM 1500, 6.2L, AMT, CB, DUAL EXIT
    Description_ASC Fits 2019-2023 Chevrolet Silverado 1500 and GMC Sierra 1500 Crew Cab and Double Cab models with 6.2L engine. Does not fit models with the Multimatic suspension option.
    Description_DES Flowmaster American Thunder Cat-back Exhaust System
    Description_EXT Fits 2019-2023 Chevrolet Silverado, GMC Sierra 1500 with 6.2L engine. - Aggressive to moderate sound
    Description_MKT This Flowmaster American Thunder® cat-back dual exhaust system for the 2019-2023 GM Silverado/Sierra 1500 (new body style) trucks with the 6.2L engine and factory dual exhaust, is perfect for the person looking for an aggressive sound level outside the truck, with a moderate interior tone and all the performance benefits you would expect from Flowmaster®. This emissions-legal bolt-on system fits all 6.2L Crew Cab with 5.5-ft and 6.5-ft beds, and all Double Cab with a 6.5-ft bed and factory dual exhaust tailpipes. Features include a mandrel-bent 3.50-inch stainless steel inlet tube flowing into a single 50 Series HD™ muffler, dual 2.50-inch mandrel-bent stainless tailpipes replacing the factory resonators and giving your truck some growl. The tailpipes are finished off with quad 4.00-inch black ceramic coated stainless steel tips that exit in place of the factory bolt-on exhaust bezels giving your truck an aggressive performance style and setting your truck apart from others, sending the message that you would rather lead than follow. Designed for an easy fit, this system includes all necessary parts, detailed instructions and hardware for an easy at home installation. Notes: Fits 147-inch and 157-inch wheelbases with 6.2L engine and factory dual tailpipes. Only fits models with factory bumper cutouts.
    Description_FAB Large 4.00-inch Black Ceramic Coated Tips
    Description_FAB Removes Factory Resonators in Tailpipes
    Description_FAB Large 50 Series HD Performance Muffler
    Description_FAB Moderately Aggressive Exterior Tone
    Description_FAB Black Ceramic Coated Quad Tips
    Description_FAB Full Stainless Steel Construction
    Description_FAB Uses Factory Hanger Locations
    Description_FAB Lifetime Limited Warranty


    This Part Fits:

    Year Make Model Submodel Notes
    2020 Chevrolet Silverado 1500 Custom Trail Boss
    2021 Chevrolet Silverado 1500 Custom Trail Boss
    2019 Chevrolet Silverado 1500 High Country
    2020 Chevrolet Silverado 1500 High Country
    2021 Chevrolet Silverado 1500 High Country
    2022 Chevrolet Silverado 1500 High Country
    2023 Chevrolet Silverado 1500 High Country
    2020 Chevrolet Silverado 1500 LT Trail Boss
    2021 Chevrolet Silverado 1500 LT Trail Boss
    2022 Chevrolet Silverado 1500 LT Trail Boss
    2023 Chevrolet Silverado 1500 LT Trail Boss
    2019 Chevrolet Silverado 1500 LTZ
    2020 Chevrolet Silverado 1500 LTZ
    2021 Chevrolet Silverado 1500 LTZ
    2022 Chevrolet Silverado 1500 LTZ
    2023 Chevrolet Silverado 1500 LTZ
    2020 Chevrolet Silverado 1500 RST
    2021 Chevrolet Silverado 1500 RST
    2022 Chevrolet Silverado 1500 RST
    2023 Chevrolet Silverado 1500 RST
    2022 Chevrolet Silverado 1500 LTD Custom Trail Boss
    2022 Chevrolet Silverado 1500 LTD High Country
    2022 Chevrolet Silverado 1500 LTD LT Trail Boss
    2022 Chevrolet Silverado 1500 LTD LTZ
    2022 Chevrolet Silverado 1500 LTD RST
    2019 GMC Sierra 1500 AT4
    2020 GMC Sierra 1500 AT4
    2021 GMC Sierra 1500 AT4
    2022 GMC Sierra 1500 AT4
    2023 GMC Sierra 1500 AT4
    2019 GMC Sierra 1500 Denali
    2020 GMC Sierra 1500 Denali
    2021 GMC Sierra 1500 Denali
    2022 GMC Sierra 1500 Denali
    2023 GMC Sierra 1500 Denali
    2022 GMC Sierra 1500 Denali Ultimate
    2023 GMC Sierra 1500 Denali Ultimate
    2019 GMC Sierra 1500 SLT
    2020 GMC Sierra 1500 SLT
    2021 GMC Sierra 1500 SLT
    2022 GMC Sierra 1500 SLT
    2023 GMC Sierra 1500 SLT
    2022 GMC Sierra 1500 Limited AT4
    2022 GMC Sierra 1500 Limited Denali
    2022 GMC Sierra 1500 Limited SLT
    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy
    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy
    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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