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2021 GMC Sierra 1500 Exhaust System Kit 8 Cyl 5.3L Flowmaster

4.5 on 53 ratings
  • Features:
    • Deep Powerful Performance Tone
    • Full Stainless Steel Construction
    • Easy Installation
  • This Flowmaster American Thunder Cat-back exhaust system is perfect for the person looking for deep, powerful sound outside the vehicle with a little growl inside the cab. This emissions-legal system is for 2WD & 4WD 2019-2022 GM 1500 trucks (new body style) with the 5.3L engine and factory single exhaust. System features include full stainless steel construction, a single in/dual outlet Super 40 Series muffler and mandrel-bent dual 2.50-inch stainless steel tailpipes for maximum performance and a deep sound. Maximum dyno gains of 21 hp and 23 lb. Ft. at the rear wheels. This bolt-on system utilizes the factory hanger locations and includes your choice of tailpipe exits, either dual out the rear exiting under the bumper, or dual out the side behind the rear wheels to help prevent blowing exhaust on your boat or trailer when towing. The system is finished off with a pair of large 3.50-inch double wall polished 304 stainless steel tips. Designed for a perfect fit, the system includes installation instructions and all the necessary hardware for an easy at home installation. Note: Fits 2/4 wheel drive Crew cab and double cab models.

Additional Fitment Information:
Vehicle Block CC Engine Bed Length Sub Model Body CID
2021 GMC Sierra 1500 V 5328 8 Cyl 5.3L 79.4 Elevation Extended Cab Pickup 325
Brand Flowmaster
Part # 817853
Condition New
Warehouse C
Flowmaster

Sierra 1500 Flowmaster Exhaust System Kit 817853 2021 GMC
  • Dual Out Rear Or Side Exit; Includes 2.5in. Tubing/Super 40 Series Muffler/3.5 in. Polished Tips; 409 Stainless Steel;50 State Legal / California Emissions Compliant
  • American Thunder Cat Back Exhaust System; Dual Out Rear Or Side Exit; Includes 2.5in. Tubing/Super 40 Series Muffler/3.5 in. Polished Tips; 409 Stainless Steel;
  • American Thunder Cat Back Exhaust System
    • Today, Flowmaster, Inc. is housed in three ultra-modern facilities together totaling over 400,000 sq. ft., one in Santa Rosa, one in West Sacramento, California and the other in Hayden, Idaho. Flowmaster employs over 250+ workers dedicated to building the highest quality U.S. made exhaust products available.

    Flowmaster operates the only exhaust Research and Design facility of its kind in the world, centered around our SuperFlow engine dynamometers complete with E.C.A. (engine cycle analysis) equipment and also SuperFlow chassis dynos. Through use of these dynos, Flowmaster's engineering staff can track the complete engine cycle in millionths of a second and can obtain exact technical data of each degree of cam rotation, from induction to the tip of the exhaust system, while also showing the power numbers that really matter, the power numbers "to the ground." Flowmaster also utilizes Spectrum Analyzers to fine "tune" the sound of each of the eleven different series of mufflers that Flowmaster currently offers, both for peak performance and just the right sound levels and tones.

    Flowmaster's product line includes exhaust products for Performance Street, Muscle Cars, Trucks, Street Rods, RV's, Motorhomes, and all types of race applications. With over 400 different muffler models, 370+ exhaust systems and numerous exhaust accessories available, Flowmaster offers you the choice of sound to fit your preference from "wild to mild" and your specific vehicle needs. With Ray still active and "hands on" with the R and D department in the development of new exhaust products and new technologies currently being tested, the future looks to be very exciting indeed.

    General

    Tail Pipe Diameter
    2.500 In.
    Tubing Diameter
    2.500 In.
    Exhaust Type
    Cat-back
    California Proposition 65 Chemical Name 2
    Chromium (hexavalent Compounds)
    Exit Position
    Dual Out Rear
    California Proposition 65 Chemical Name 1
    Nickel (metallic)
    WARNING CA Proposition 65
    Yes
    WARNING CA Proposition 65 Message
    Warning: Cancer And Reproductive Harm - Www.p65warnings.ca.gov
    Inlet Inside Diameter
    2.500 In.

    Packaging

    package quantity
    1
    weight
    59.85 lb
    Information on technical characteristics, the delivery set, the country of manufacture and the appearance of the goods is for reference only and is based on the latest information available at the time of publication.

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