Product Summary

Cat-Back Exhaust System Type, Single Single or Dual

    Key Specs

    MFG. Part #817640
    Exhaust System TypeCat-Back
    Single or DualSingle
    Exhaust Pipe Size3.5"
    Bed Side TypeStandard

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    Flowmaster 817640 Details

    Flowmaster Force II cat-back exhaust system for the 2011 to 2015 GM 2500HD and 3500HD extended cab and short bed truck is perfect for the person looking for mild to moderate sound levels with all of the performance benefits that you would expect from Flowmaster. This bolt on emissions legal system for the 6.0L V8 gasoline engines features a 50 Series Big Block muffler, mandrel bent 3.50 inch stainless steel tubing, and a polished 4.00 inch stainless steel tip with Flowmaster's logo embossed into it. The exhaust system is manufactured in the USA and is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.

    • Stainless Steel Construction
    • Dyno Tuned For Maximum Performance
    • Patented Delta Flow Technology
    • Lifetime Limited Warranty


    2011-2013 Chevrolet Silverado 2500 HD 364 CID/6.0L V8
    2011-2013 Chevrolet Silverado 3500 HD 364 CID/6.0L V8
    2011-2013 GMC Sierra 2500 HD 364 CID/6.0L V8
    2012-2013 GMC Sierra 3500 HD 364 CID/6.0L V8
    2015 Chevrolet Silverado 2500 HD
    2015 GMC Sierra 2500 HD


    Flowmaster 817640 Specifications

    MFG. Part #817640
    Exhaust System TypeCat-Back
    Single or DualSingle
    Exhaust Pipe Size3.5"
    Bed Side TypeStandard
    Speedway Motors Catalog Part #378-817640
    Exhaust ExitSingle Passenger Side
    Sound LevelMild/Moderate
    Muffler(s) IncludedYes
    Muffler Quantity1
    Muffler ConnectionsSingle Inlet | Single Outlet
    Cab TypeExtended
    Exhaust Tip IncludedYes
    Exhaust Tip Quantity1
    Exhaust Tip ShapeRound
    Exhaust Tip CutAngle
    Exhaust Tip Edge StyleRolled Edge
    Exhaust Tip Size4.00"
    Exhaust Tip Length10"
    Exhaust System Material409S Stainless Steel
    Exhaust System FinishNatural
    Exhaust Pipe ColorNatural
    Muffler Series50 Series
    Muffler Material409 Stainless Steel
    Muffler ColorNatural
    Exhaust Tip Material304 Stainless Steel
    Exhaust Tip FinishPolished
    Exhaust Tip ColorNatural
    Inlet Quantity1
    Inlet Size3.50"
    Outlet Size3.5"
    Tailpipe Diameter3.5"
    Catalytic Converter(s) IncludedNo
    Hardware IncludedYes
    Heat ShieldNo
    Sold in QuantityKit
    GTIN Code700042029518