• FLO817602.jpg
  • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
  • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
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  • aggressivemoderatesoundlevel.jpg
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    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817602
    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817602
    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817602
    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817602
    • Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817602
    • FLO817602.jpg
    • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • American Thunder Cat-Back Exhaust System Fits 2011-2018 Chevrolet Silverado 1500, Gmc Sierra 1500 With 6.2L Engine Aggressive To Moderate Sound Flowmaster
    • 817602_2.jpg
    • 817602.jpg
    • 817602_3.jpg
    • 817602_5.jpg
    • 817602_dyno.jpg
    • 817602_pk.jpg
    • aggressivemoderatesoundlevel.jpg
    • 817602_2.jpg
    • 817602.jpg
    • 817602_3.jpg
    • 817602_5.jpg
    • 817602_dyno.jpg
    • 817602_pk.jpg
    • aggressivemoderatesoundlevel.jpg
    Sale!

    Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817602

    Vendor: Flowmaster
    Part Number: 817602
    Save $147
    $1,171.95 $1,318.95

    In Stock

    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.
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    International Shipping Available: email sales@berryperformancesales.com for a quote.
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    Product DetailsFAQReviewsRelated Products
    The American Thunder® Cat-back exhaust system for 2011-2018 Chevrolet Silverado and GMC Sierra 1500 trucks with the 6.2L engine, is perfect for the person looking for an aggressive exterior sound level while maintaining a moderate interior tone. This bolt-on stainless steel system features a 3.50-inch mandrel-bent inlet pipe flowing into the 50 Series™ HD performance muffler with large 4.00-inch internals and a built-in tuned resonance chamber to minimize interior drone. The system has dual 2.50-inch mandrel-bent tailpipes which use the factory hanger locations and are finished off with large 3.50-inch polished stainless steel tips. This exhaust system gives you choices for tailpipe exit location either out each side behind the rear tires if you do a lot of towing, or straight-out under the rear bumper for a muscular look. The exhaust system is covered by our Lifetime Limited Warranty and includes all necessary parts and hardware for easy installation you can do at home. Note: Fits 2/4 WD model with Crew Cab/Short Bed (143.5" WB), Crew Cab/Standard Bed (153" WB) and Double Cab/Standard Bed (143.5" WB).


    Flowmaster Flowmaster American Thunder Cat-back Exhaust System 817602


    Specifications:

    Description_ABR SYS 11-18 GM
    Description_SHO SYS 11-18 GM 1500 CC
    Description_INV 11-18 GM 1500 CC-EC 6.2L AMT DOR
    Description_ASC Fits 2011-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 with 6.2L engine, 2/4 WD model with Crew Cab/Short Bed (143.5" WB), Crew Cab/Standard Bed (153" WB) and Double Cab/Standard Bed (143.5" WB).
    Description_DES Flowmaster American Thunder Cat-back Exhaust System
    Description_EXT Fits 2011-2018 Chevrolet Silverado 1500, GMC Sierra 1500 with 6.2L engine. - Aggressive to moderate sound
    Description_MKT The American Thunder® Cat-back exhaust system for 2011-2018 Chevrolet Silverado and GMC Sierra 1500 trucks with the 6.2L engine, is perfect for the person looking for an aggressive exterior sound level while maintaining a moderate interior tone. This bolt-on stainless steel system features a 3.50-inch mandrel-bent inlet pipe flowing into the 50 Series™ HD performance muffler with large 4.00-inch internals and a built-in tuned resonance chamber to minimize interior drone. The system has dual 2.50-inch mandrel-bent tailpipes which use the factory hanger locations and are finished off with large 3.50-inch polished stainless steel tips. This exhaust system gives you choices for tailpipe exit location either out each side behind the rear tires if you do a lot of towing, or straight-out under the rear bumper for a muscular look. The exhaust system is covered by our Lifetime Limited Warranty and includes all necessary parts and hardware for easy installation you can do at home. Note: Fits 2/4 WD model with Crew Cab/Short Bed (143.5" WB), Crew Cab/Standard Bed (153" WB) and Double Cab/Standard Bed (143.5" WB).
    Description_FAB Dyno Tuned For Maximum Performance
    Description_FAB Uses the Factory Hanger Locations
    Description_FAB 50 Series HD Performance Muffler
    Description_FAB Your Choice of Two Tailpipe Exits
    Description_FAB Clears the Factory Spare Tire
    Description_FAB Stainless Steel Construction
    Description_FAB Lifetime Limited Warranty
    Description_ABR SYS 11-18 GM
    Description_SHO SYS 11-18 GM 1500 CC
    Description_INV 11-18 GM 1500 CC-EC 6.2L AMT DOR
    Description_ASC Fits 2011-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 with 6.2L engine, 2/4 WD model with Crew Cab/Short Bed (143.5" WB), Crew Cab/Standard Bed (153" WB) and Double Cab/Standard Bed (143.5" WB).
    Description_DES Flowmaster American Thunder Cat-back Exhaust System
    Description_EXT Fits 2011-2018 Chevrolet Silverado 1500, GMC Sierra 1500 with 6.2L engine. - Aggressive to moderate sound
    Description_MKT The American Thunder® Cat-back exhaust system for 2011-2018 Chevrolet Silverado and GMC Sierra 1500 trucks with the 6.2L engine, is perfect for the person looking for an aggressive exterior sound level while maintaining a moderate interior tone. This bolt-on stainless steel system features a 3.50-inch mandrel-bent inlet pipe flowing into the 50 Series™ HD performance muffler with large 4.00-inch internals and a built-in tuned resonance chamber to minimize interior drone. The system has dual 2.50-inch mandrel-bent tailpipes which use the factory hanger locations and are finished off with large 3.50-inch polished stainless steel tips. This exhaust system gives you choices for tailpipe exit location either out each side behind the rear tires if you do a lot of towing, or straight-out under the rear bumper for a muscular look. The exhaust system is covered by our Lifetime Limited Warranty and includes all necessary parts and hardware for easy installation you can do at home. Note: Fits 2/4 WD model with Crew Cab/Short Bed (143.5" WB), Crew Cab/Standard Bed (153" WB) and Double Cab/Standard Bed (143.5" WB).
    Description_FAB Dyno Tuned For Maximum Performance
    Description_FAB Uses the Factory Hanger Locations
    Description_FAB 50 Series HD Performance Muffler
    Description_FAB Your Choice of Two Tailpipe Exits
    Description_FAB Clears the Factory Spare Tire
    Description_FAB Stainless Steel Construction
    Description_FAB Lifetime Limited Warranty
    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 Silver
    9874 Clamp-On
    9876 Angled
    1162 3.50
    9877 Angle Cut
    1163 Polished
    9881 No
    10104 13.00
    1164 304 Stainless Steel
    1161 2
    9878 No
    10980 Round
    9875 Double Wall
    9870 Dual Out Side
    9870 Dual Out Rear
    200 Natural
    353 No
    3390 Performance
    4364 Yes
    Heat Shield Included No
    596 Clamp-On
    9871 2.50
    Mount Type Uses Factory Hangers
    92 Yes
    9884 5.00
    1892 18.00
    4372 409 Stainless Steel
    4373 Oval
    9882 Natural
    4367 No
    4368 No
    Muffler Included Yes
    9962 Slip-Fit
    4365 3.50
    4366 3.13
    9963 Slip-Fit
    Muffler Outlet Diameter 2.50
    4375 2
    Muffler Part Number Kit Only
    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
    Tip Logo Embossed
    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 Silver
    9874 Clamp-On
    9876 Angled
    1162 3.50
    9877 Angle Cut
    1163 Polished
    9881 No
    10104 13.00
    1164 304 Stainless Steel
    1161 2
    9878 No
    10980 Round
    9875 Double Wall
    9870 Dual Out Side
    9870 Dual Out Rear
    200 Natural
    353 No
    3390 Performance
    4364 Yes
    Heat Shield Included No
    596 Clamp-On
    9871 2.50
    Mount Type Uses Factory Hangers
    92 Yes
    9884 5.00
    1892 18.00
    4372 409 Stainless Steel
    4373 Oval
    9882 Natural
    4367 No
    4368 No
    Muffler Included Yes
    9962 Slip-Fit
    4365 3.50
    4366 3.13
    9963 Slip-Fit
    Muffler Outlet Diameter 2.50
    4375 2
    Muffler Part Number Kit Only
    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
    Tip Logo Embossed
    26 Cat-Back
    6014 No
    2126 Not Applicable
    Warning California Proposition 65
    Pipe Color Silver
    9885 10.00


    This Part Fits:

    Year Make Model Submodel Notes
    2014 Chevrolet Silverado 1500 High Country
    2015 Chevrolet Silverado 1500 High Country
    2016 Chevrolet Silverado 1500 High Country
    2017 Chevrolet Silverado 1500 High Country
    2018 Chevrolet Silverado 1500 High Country
    2011 Chevrolet Silverado 1500 LT
    2012 Chevrolet Silverado 1500 LT
    2013 Chevrolet Silverado 1500 LT
    2011 Chevrolet Silverado 1500 LTZ
    2012 Chevrolet Silverado 1500 LTZ
    2013 Chevrolet Silverado 1500 LTZ
    2014 Chevrolet Silverado 1500 LTZ
    2015 Chevrolet Silverado 1500 LTZ
    2016 Chevrolet Silverado 1500 LTZ
    2017 Chevrolet Silverado 1500 LTZ
    2018 Chevrolet Silverado 1500 LTZ
    2011 GMC Sierra 1500 Denali
    2012 GMC Sierra 1500 Denali
    2013 GMC Sierra 1500 Denali
    2014 GMC Sierra 1500 Denali
    2015 GMC Sierra 1500 Denali
    2016 GMC Sierra 1500 Denali
    2017 GMC Sierra 1500 Denali
    2018 GMC Sierra 1500 Denali
    2011 GMC Sierra 1500 SLE
    2012 GMC Sierra 1500 SLE
    2013 GMC Sierra 1500 SLE
    2011 GMC Sierra 1500 SLT
    2012 GMC Sierra 1500 SLT
    2013 GMC Sierra 1500 SLT
    2014 GMC Sierra 1500 SLT
    2015 GMC Sierra 1500 SLT
    2016 GMC Sierra 1500 SLT
    2017 GMC Sierra 1500 SLT
    2018 GMC Sierra 1500 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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