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Flowmaster Force II Dual Exhaust System; Side/Rear Exit (14-18 5.3L Sierra 1500)

Item S503514
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Market Price $986.64 You Save 13% ($128.69)
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$857.95 (kit)

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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Force II Cat-Back Exhaust System
      • Moderate Sound Level Exhaust Tone
      • Maintains Sound Level Inside and Outside
      • Delta Flow Technology
      • Dyno Tuned for Optimum Performance
      • Super 50 Series Muffler Included
      • Dual 2.5-inch Steel Mandrel Bent Tailpipes
      • 3.5-inch Stainless Steel Polished Tips
      • Easy Bolt-On Installation
      • Welding Required
      • Lifetime Limited Warranty
      • Fits All 2014-2018 5.3L GMC Sierra 1500 Double and Crew Cab Models
      • Not Compatible with 2WD Crew Cab w/ 2-Piece Driveshaft


      Cut the Noise. The Flowmaster Force II Cat-Back Exhaust - Split Side/Rear Exit is a perfect addition for that warm moderate sound level exhaust tone. Settle for a less aggressive sound that is ideal for producing a true performance engine rumble. With this cat-back exhaust system, you can do away with tiring and attention-drawing noise, and invest in a special tool that maintains sound level both inside and outside your vehicle.

      Flow Performance. Delta Flow Technology and mandrel-bent tubing are the source of Flowmasters performance enhancing benefits. Improved acceleration power, torque, and mileage without the burden of a loud exhaust output makes this cat-back system not only a sound choice but a necessity. Dyno tuned for optimum performance quality.

      Construction. This Cat Back system is comprised of a stainless-steel super 50 Series Muffler with dual 2.5-inch 16-gauge stainless-steel mandrel bent tailpipes and 3.5-inch stainless-steel polished tips. Beautifully designed and calibrated with multiple exit styles and lasting quality construction.

      Installation. This cat-back exhaust system commands an easy bolt-on installation with basic tools. Hangers, hardware, and instructions are included for a thorough installation. Welding will be required.

      Lifetime Limited Warranty. Flowmaster are backed by a lifetime limited warranty and guarantees coverage on all stainless-steel products.

      Application. The Flowmaster Force II Cat-Back Exhaust - Split Side/Rear Exit is designed to fit on all 2014-2018 5.3L GMC Sierra 1500 models. Note: Designed for double & crew cab models. It is not compatible on 2WD crew cab models with 2-piece driveshaft.

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      Fitment: 2014 2015 2016 2017 2018 Details

      Flowmaster 817666

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Inlet Pipe
      • (1) 6.5’ Bed Extension
      • (1) Muffler
      • (1) Tailpipe, Right
      • (1) Tailpipe, Left Front
      • (1) Tailpipe, Left Rear
      • (2) Side Exit Pipes R/L
      • (2) Rear Exit Pipes R/L
      • (2) Stainless Tips
      • (3) Hangers;
      • (6) Brackets;
      • Installation Hardware

      Tech Specs


      Customer Reviews (100+)

        Questions & Answers

        10 More Questions

        Will It Fit My Sierra 1500

        • 5.3L V8 - 14, 15, 16, 17, 18

        Designed for Double & Crew Cab Models. It is not compatible on 2WD Crew Cab Models with 2-Piece Driveshaft.

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