Flowmaster® 817853 - American Thunder™ 409 SS Cat-Back Exhaust System with Split Rear/Side Exit

62 reviews|Item # mpn4628915728
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    Notes:
    • The system comes with Super 40 Series muffler
    • Remember to check your local or state laws regarding vehicle noise restrictions and Emission Standards
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    $1,168.45
    $1,229.95Save $61.50 (5%)
    In Stock (10) - Ships in 24 to 48 hrs
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    Vehicle Fitment

    Chevy
    GMC

    Specifications

    Exhaust System Type
    Cat-Back
    Exhaust Tubing Material
    409 SS
    Exit Location
    Split Rear/Side
    Main Tubing Diameter
    2.5"
    Exhaust System Sound
    Aggressive / Loud
    Muffler Inlet Diameter
    3"
    Muffler Outlet Diameter
    2.5"
    Muffler Series
    Super 40
    Muffler Quantity
    1
    Muffler Body Length
    13.5"
    Muffler Overall Length
    19.5"
    Muffler Body Material
    409 SS
    Muffler Body Finish
    Black Painted
    Muffler Body Shape
    Oval
    Muffler Configuration
    Centered - Dual Outlet
    Muffler Type
    Reflection
    Tip Quantity
    2
    Tip Finish
    Polished
    Tip Material
    304 SS
    Tip Type
    Double Wall
    Tip Outlet Diameter
    3.5"
    Tip Length
    13"
    Tip Shape
    Round
    Tip Cut Type
    Angle-Cut
    Hardware Included
    Yes
    Catalytic Converter(s) Included
    No
    Exhaust Type
    Single in/Dual out
    Exit Location
    Split rear/Split side
    Intermediate Pipe Diameter (in.)
    3.00 in.
    Muffler Configuration
    Single inlet/Dual outlet
    Muffler Finish
    Black
    Muffler Included
    Yes
    Muffler Material
    409 stainless steel
    Muffler Quantity
    One
    Muffler Style
    Chambered
    Quantity
    Sold as a kit.
    Remanufactured
    No
    System Finish
    Natural/Black
    System Material
    409 stainless steel
    System Style
    Cat-back
    Tailpipe Diameter (in.)
    2.50 in.
    Tip Color
    Polished
    Tip Cut
    Slant
    Tip Edge Style
    Beveled edge, double-wall
    Tip Included
    Yes
    Tip Material
    304 stainless steel
    Tip Outlet Size (in.)
    3.50

    Includes

    • 26742S Inlet Pipe x1
    • TB700S Extension Pipe x1
    • 8530452-Z AMT Muffler x1
    • 86566S Left Front Tailpipe x1
    • 86568S Left Rear Tailpipe x1
    • 86567S Right Tailpipe x1
    • 86569S Side Exit Pipe x2
    • 86570S Rear Exit Pipe x2
    • ST461 Tips x2
    • PK989 Hardware Pack includes:
    • 226HA Left Rear Frame Hanger x1
    • HA566 Backing Plates x2
    • HA168 Rubber Hanger x1
    • MC250BS 2-1/2" Band Clamp x5
    • MC300BS 3" Band Clamp x2
    • HW220 3/8"-16 x 4" Hex Cap Screw x1
    • HW303 3/8" Flat Washer x1
    • HW309 3/8" Lock Washer x1
    • HW103 3/8" Nut x1
    • HW502 7/16" Hanger Keepers x2
    • HW503 1/2" Hanger Keepers x4
    • HW505 15" Zip Ties x1

    Features

    • High Quality Performance Sound
    • Increases Torque and Power
    • Mandrel Bent 16 Gauge Tubing
    • Includes Hangers and Hardware for Easy Installation
    • Every System Tuned on Dynamometer
    • Flowmaster Special Offers

    Product Details

    American Thunder™ 409 SS Cat-Back Exhaust System with Split Rear/Side Exit (817853) by Flowmaster®. Exhaust System Type: Cat-Back. Exhaust Tubing Material: 409 SS. Main Tubing Diameter: 2.5". Exhaust System Sound: Aggressive / Loud. American Thunder gives you the classic AGGRESSIVE or MODERATE sound (depends on application and exhaust type) of a Flowmaster chambered exhaust, which is the classic sound of classic American big performance engines. This is a system that gives the most sedate vehicle a performance rumble. American Thunder is perfect for a wide range of cars, from ponies to sleepers.

    American Thunder gives you exactly the sound that is promised by the name of the series. The exhaust sound of the American Thunder system has become a symbol of American power that is recognized all over the world. American Thunder is the most popular of the Flowmaster exhaust systems, enhancing power, torque, throttle response and mileage for automobile enthusiasts all over the world.

    All Flowmaster exhaust systems give the same improvement of performance. All Flowmaster exhaust systems produce a beautiful deep performance tone. Choosing between the five different exhaust systems is not a technical decision – it is all up to your personal taste. It’s A Sound Decision™. The racing origin is evident in every Flowmaster exhaust system. All the five series of systems are tuned for maximum performance. They differ in technology and tuning, and thus in tone and character, giving you a performance engine sound to your personal liking.

    Flowmaster exhaust systems employ two unique technologies, the patented Delta Flow and the Laminar Flow. They give different characters of sound and can be tuned to achieve the desired exhaust note. Flowmaster Exhaust System Technology is so versatile and gives such a high degree of control that it is used both by racers, who want maximum power, and by the U.S. Air Force in Stealth applications, where maximum silence and minimum heat emissions are prime considerations.

    Be it for a domestic or import truck, SUV, off-road warrior, daily driver, muscle car, euro-spec cruiser or sport compact vehicle, Flowmaster technicians personally hand select the right muffler, tubing size, resonator, and tip to make the process easy for you. Best of all, Flowmaster stainless steel exhaust systems are covered by a Limited Lifetime Warranty; ensuring that your exhaust will last as long as you own your vehicle. If you choose aluminized steel products, Flowmaster backs them up with a 3-year warranty.

    Flowmaster® - Exhaust TypesFlowmaster® - GuideFlowmaster® - Types of MufflersFlowmaster® - Exhaust Systems ComparisonFlowmaster® - WarrantyFlowmaster® - CatalogsMade In USAFlowmaster Authorized DealerVideoFAQAbout us
    Brand:
    Flowmaster
    Part Number:
    817853
    UPC:
    700042039012

    Reviews

    (62)
    Only authorized customers can leave a review on our website. We would love to know what you like or dislike about the product. Share your opinion on product quality, appearance, installation, and other characteristics.
    /5
    1-10 of 62 Reviews
    5 of 5
    Exhaust Line
    Complete exhaust line goes perfectly on my Chevrolet pick-up Very good quality
    Flowmaster® - American Thunder™ Cat-Back Exhaust System with Split Rear/Side Exit
    Posted by Bertrand (St Pierre Brouck) / February 28, 20231993 Chevy CK Pickup
    5 of 5
    Great Value
    This went on a 2020 Ram 1500 Bighorn. The instructions were easy to read, and the installation was a breeze. Quality of parts is top notch, and fitment was right in the money. I’m impressed with how well this resonator delete kit woke up my Ram truck. Great sound inside and outside the cabin at low speeds, and it settles down nicely at highway speeds.
    Posted by Patrick (Killeen, TX) / April 04, 20222019 Ram 1500
    4 of 5
    Love It
    I am in joying my American thunder cat back exhaust system on my 2006 Durango I have no complaints it now sounds like a Hemi instead of a typical mom car
    Flowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System with Dual Rear Exit
    Posted by Johnathan (Temple, TX) / August 07, 20212006 Dodge Durango
    3 of 5
    OK, but Not Great. Poor Value for the $.
    First issue was probably the fault of the carrier, but the system arrived with the box utterly destroyed. Somehow, none of the parts were missing or damaged except for the Flowmaster stickers. Value for the cost seems to be... not great. The hanger rods lack the retaining barb at the end like the stock hangers and instead you're supplied with cheesy push-on retaining washers that will probably rust through the first winter here in the Northeast. The supplied muffler clamps are cheap and flimsy as compared to decent quality ones. The U-bolts are thin and the nuts are only 1/2" hex, not 9/16" and lack the heavy integrated locking washer that the nuts on heavy duty clamps come with. In hindsight, I should have tossed the supplied clamps and bought decent ones to replace them. The biggest issue is that as supplied, the driver's side tailpipe was too short. Assembled using adequate engagement with the muffler outlet, the pipe was touching the differential cover on the rear axle. I had to purchase and insert a 2-1/2" ID X 2-1/2" OD adapter (and some decent clamps) between the muffler outlet and tailpipe in order to space the tailpipe back far enough to prevent the pipe from rubbing through the diff cover and allow the rear axle to be serviced without removing the tailpipe. I expected better fitment from an established company like Flowmaster. On the positive side, the muffler seems to be built very well and the system sounds pretty good. The chrome tips were plated well and look good. The included option of running the exit straight back or out the side was a nice touch. Would I purchase it again, now knowing what I know? Maybe. Would I recommend it to someone without the skill and abilities to correct the deficiencies I found and related above? No.
    Posted by Customer / July 21, 20211999 Chevy Silverado 1500
    5 of 5
    American Thunder
    I installed this system on my 2019 Chevy Silverado High Country and it was a welcomed upgrade. The sound is not overpowering at start and idle but when accelerated it provides a throaty sound. I recommend this to all Chevy Silverado owners. You will not be disappointed.
    Posted by Jim (Peabody, MA) / June 29, 20212019 Chevy Silverado 1500
    5 of 5
    The Way a Truck Should Sound
    Needed to get a new exhaust since the "factory replacement" that a muffler shop put on rusted out in less than 4 years. I've had great success ordering things from TRUCKiD and decided on this Flowmaster system. Install was simple, had to do a little tugging to get the muffler to clear the drive shaft, but that was it. Truck now sounds like a V8 should and I've had a small improvement in mpg as long as I can keep my foot out of it.
    Flowmaster® 17392 - American Thunder™ Aluminized Steel Cat-Back Exhaust System with Dual Side Exit
    Posted by Carl (Toms Brook, VA) / May 29, 20212004 Chevy Silverado 1500
    2 of 5
    Flowmaster
    Since installed on my 08 Sierra my engine light is on and has been on for the past month, wish I stayed with stock exhaust.
    Posted by Customer / April 29, 20212008 GMC Sierra 1500
    5 of 5
    Great Cat Back System
    Love the look and sound this brings to my 2020 GMC AT4 HD.
    Posted by Customer / April 24, 20212020 GMC Sierra 2500
    5 of 5
    Good Enough
    Not my first Flowmaster exhaust system, had one added to another vehicle. This one is just as good as the other one. Easy install, sounds great to my ears when driving my truck. Just the right tone inside the cab with windows up or down.
    Flowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System with Split Rear/Side Exit
    Posted by Robert (Mesa, AZ) / March 20, 20212018 GMC Sierra 1500
    4 of 5
    It's Okay
    The exhaust fits great but it sounds like a hybrid now. A bit disappointed since it sounds like a pussy now, but at least I'll pass smog.
    Flowmaster® - American Thunder™ Cat-Back Exhaust System with Split Side Exit
    Posted by Oscar (Auburn, CA) / March 08, 20212003 Chevy Avalanche

    Questions and Answers

    (0)
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