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Flowmaster Outlaw Dual Exhaust System; Side/Rear Exit (14-18 5.3L Silverado 1500)

Item S104238
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Market Price $892.64 You Save 12% ($102.69)
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$789.95 (kit)

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      Review & Installation Video

      Product Information

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


      • Aggressive Race-Level Sound
      • Significantly Improves Horsepower and Torque
      • Delta Flow™ Super 10 Series Welded Baffle Muffler
      • 3-in. Mandrel Bent Stainless Steel Tubing
      • 4-in. Black Ceramic Coated Exhaust Tips
      • Split Side Behind Rear Wheels or Dual Rear Exit
      • Bolt-On Installation
      • Designed for Double and Crew Cab Models
      • Not Compatible with 2WD Crew Cab Models with 2-Piece Driveshaft
      • Fits 2014 to 2018 Chevrolet Silverado 1500 5.3L Models


      Race-Inspired Aggressive Sound. The Flowmaster Outlaw Cat-Back Exhaust is designed to deliver aggressive sound levels both internally and externally. This lets enthusiasts experience Flowmaster’s renowned sound while also enjoying their exhaust’s performance-boosting characteristics. Due to the sound levels emitted, this system is not intended for street driving. As a bonus, the exits can be configured as either split side or dual rear for flexible customization.

      High-Performance Exhaust. Flowmaster’s patented Delta Flow™ technology and the precision-machined mandrel-bent tubing dramatically improve scavenging and exhaust flow to improve your truck’s performance.  Each system is dyno-tuned for the best performance.

      High-Quality Materials and Construction. Like other Flowmaster products, the Outlaw is made from high-grade stainless steel and built to last. Additionally, the black ceramic coated tips add a rugged finished look to your truck.

      Direct Fit Replacement Upgrade. The Outlaw is precisely designed to fit your application and requires no additional fabrication. The installation utilizes the factory mounting point to simplify the process. And while not required, Flowmaster recommends welding the slip-fit connections for a more secure installation.

      Application. The Flowmaster Outlaw Cat-Back Exhaust with split side or rear exit is designed to fit Fits 2014 to 2017 Chevrolet Silverado 1500 5.3L models with either Double or Crew Cab. It’s not compatible with 2WD Crew Cab models with the 2-piece driveshaft.

      Fitment: 2014 2015 2016 2017 2018 Details

      MPN# 817689

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (7)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 7 customers

      Installation Time: Afternoon

      • March 23, 2020

        5 2017 LT - JohnB Installation Time: Afternoon

        Excellent Exhaust

        The Flowmaster Outlaw dual exhaust system sounds awesome on my truck. If you want to hear the sounds of Bald Eagles screaming USA, USA, while the National Anthem is playing and fireworks popping off all around you just get this exhaust and enjoy.

        Helpful (0)
      • March 10, 2020

        5 2015 - ChadH Installation Time: Afternoon

        Flowmaster Outlaw

        This is a 5 star system easy to install and sounds amazing. Its fairly loud. Install took 2 hours to remove old and install new. Only thing i didnt like was not flow masters fault is my truck has Active Fuel Management and shifts to 4 cylinder mode to save gas then the exhaust doesnt sound very well. Easy fix i got an AFM disabler from Arange Technologies and it prevents 4 cylinder mode. Problem fixed!

        Helpful (0)
      • December 06, 2019

        5 2016 LT - Jiggity Installation Time: Less than 1 Hour

        Dual Exhaust

        This product was pretty easy to install myself right in my driveway. Need very few tools to complete the job. I did use a sawsall to cut up my old exhaust which made it easier to get off the truck when laying upside down. The sound is great. Very deep nice tone to it. It did add some HP as well.

        Helpful (0)
      • July 13, 2019

        5 2014 LT - Paul1994

        Sounds great, looks great

        Sounds amazing from a cold start. Acceleration sounds great. Far more aggressive sound. Drone in the cabin isn't terrible. Hopefully you don't live in a very tight neighborhood though.

        Helpful (2)
      • January 16, 2019

        4 2018 LT - CharlesT Installation Time: Afternoon

        Perfect exhaust. Something wrong with install

        Install took longer than expected because opening in the tips were a little smaller than the outside of the rear exit pipes. Also the clamps took an air gun to tighten which I still feel wasn’t enough. Besides that though I love the sound of this exhaust inside and out. Little to no drone which keeps my cab staying quiet. Ceramic coated black tips are the ish and the sound again is just wanted I wanted if I was spending this money. Along with the 409 stainless. American made deserves flowmaster.

        Helpful (5)
      • November 07, 2018

        5 2018 LT - KyleH Installation Time: Afternoon

        Sounds really good

        If you have a neighbor that lives 20ft away and you wake up early in the morning for work. You may want to consider one with a bigger muffler. Not an obnoxiously loud in the cabin.

        Helpful (10)
      • September 26, 2018

        5 2017 - JohnC Installation Time: Afternoon

        Awesome kit!

        Got the kit installed and sounds great! Gave me a about 3mpg gaines when paird with a CAI

        Helpful (11)

      Questions & Answers (2 answers)

      2 Top Rated Questions

      Will putting this on void my warranty on my truck sorry first time purchasing a new truck?

      With adding a new exhaust system on the truck will that help with save on gas as well as make it sound better

      • The effect on your gas mileage will be negligible. Unless you are looking at headers, you should be focusing purely on the sound you desire.

      Helpful (0)
      Post Your Question

      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 (Right and Left)
      • (2) Rear Exit Pipes (Right and Left)
      • (2) Stainless Tips
      • Installation Hardware

      Will It Fit My Silverado 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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