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

Item S104244
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$900.95 (kit)

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      Video Review & Installation

      The Flowmaster Force II dual exhaust system with the side and rear exit for all '14 to '18 5.3-powered Silverados is perfect for the Silverado owner that's looking to enhance the sound of their truck without going too loud, wants the choice of side or rear exit, and also likes the polished stainless steel look. This is also going to fit all '14 to '18 5.3-powered GMC Sierras as well. This cat-back is manufactured out of a high-grade 304 stainless steel which is certain to last those salty winter conditions, features 2.5-inch piping throughout with polished 3.5-inch tips. This Flowmaster kit features their Delta Flow Super 50 Series muffler which is gonna give you stock to moderate sound levels and deliver a nice, rich tone. It's gonna be enough to know that it's an upgraded exhaust but not enough to wake your neighbors. I'm gonna give this system a two out of five on our wake the neighbor scale. Another great thing about this kit is it gives you the choice of either a dual rear exit or a dual side exit which comes out right behind the tires. Priced around the $800 mark, this is gonna be a middle-grounder in terms of exhaust prices. It's not gonna be as expensive as some of those premier brands out there but it's gonna be more than those cost-effective options. Before we get into the install, I just wanna go over some fitment with you guys. This system is not gonna work on any of the standard cab models. Due to driveshaft changes, it's only gonna work on the four-wheel-drive Crew Cab models and will fit both the two-wheel-drive and four-wheel-drive Double Cabs. Install on this cat-back is gonna be moderate. It does come with its own hardware and reuses the factory mounting points so I'm gonna give it a two out of three wrenches on our difficulty meter. It should take you around two hours with basic hand tools. With that, let me show you how to get this on your truck. For this install, you're gonna need a 3/8 drive impact, 3/8 drive ratchet, 15-millimeter wrench, 10-millimeter wrench, 10-millimeter socket, 15-millimeter socket, 13-millimeter socket, and optional is an exhaust hanger removal tool. All right. So the first step in the install, we're gonna have to get our old factory system off of this truck. What we're gonna start with is we are gonna remove this 13-millimeter clamp right here. That will free up our flex pipe and we could get to work on these hangers. I do have our exhaust supported with a pole jack right now. Since we are on a lift, we should be able to take it right out. If you are working on the ground, you might end up having to Sawzall this part, but since we're on a lift, we're gonna undo those hangers. It should slide right out.Next, we're gonna grab our exhaust hanger removal tool and hit these four hangers along the exhaust. Now with this one, this is the last hanger so when you do this one, you wanna make sure the exhaust is supported, otherwise, it's gonna fall. Now our stock system is just resting on the frame rail and the pole jack. I'm gonna lower that pole jack and we can slide this system out. Next, we're gonna wanna grab our inlet pipe and mount that up to our catalytic converter. We are going to reuse the 13-millimeter clamp. Next, we're gonna move on to the muffler, but before you do, if you have a long-wheelbase truck, you're gonna use this extension pipe to reach. Since we have a short-wheelbase truck, we're just gonna throw this aside. No need to use it. Next is gonna be our muffler. I'm just gonna use a pole jack to support it while I get it all lined up. Next, we're gonna tighten down this 3-inch band clamp using a 15-millimeter socket. I'm just gonna snug it up just enough so I can remove the pole jack from underneath the muffler. Next, we're gonna move on to our over the axle pipes. We're gonna start with the passenger side which is the one that has both hangers on it. With him in the right spot, I'm just gonna snug this down to hold them in place. This is not gonna be the final tighten, just something to keep them from shifting. Next, we're gonna do the same thing with the driver side. Next up is our driver side new hanger pipe. Now before we tighten this tube down, I just wanted to point out something crucial with this clamp. As you can see, the way it sits right now, if we lower this truck and compress this shock, it's gonna impact the bolt side of this clamp. That's not how you want it. So for more clearance over there, we're gonna go over here. Next, we're gonna move on to mounting our new exhaust hanger. This is a very crucial step as you could see. We're gonna be going into this oblong hole here. So what you wanna grab is the bolt, a washer, a lock washer, and this backing plate here to kind of make that hole straight through, otherwise you'd be warping your new hanger. And we're just gonna insert our back half of the backing plate here. Once you're at this point, the order is going to go new plate and then the flat side of our new hanger and then a lock washer and a nut. All right. Next, we're gonna grab our 15-millimeter wrench and socket to tighten him down. And there's a nice hole in the frame rail here for you to get a wrench in there. And we're just gonna stretch this pipe and get it over our new hanger. Now is the time for our tailpipes. Now, the great thing about this kit is you have two options. You could either go with the side exit which looks like this little U-pipe here. That would go on and look like that. What we're gonna do today instead is we're gonna do our standard rear exit and that one goes on and looks just like that. And we're just gonna snug this nut up using a 15-millimeter socket and then do the same thing for the other side. And the last step is gonna be our exhaust tip. You're gonna need a 10-millimeter socket and a 10-millimeter wrench to tighten him down and it's gonna be the same thing for the other side. Now, with the install completed, what you wanna do is make sure your tailpipes are situated and oriented properly. Once they're in a spot you like, run through the whole thing, tighten up all those clamps, and that is gonna be it. That is gonna do it for my review and install of the Flowmaster Force II dual exhaust system with the side and rear exit. Thanks for watching. My name is Joe and for all things Silverado and Sierra, keep it right here at

      Product Information

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


      • Mild to Moderate Sound Levels
      • Significantly Improves Horsepower and Torque
      • Delta Flow ™ Super 50 Series Muffler
      • Features 2.5 in. Mandrel Bent Stainless Steel Tubing
      • Has 3.5 in. Polished Stainless Steel Exhaust Tips
      • Dual Side or Dual Rear Exit
      • Designed for Easy Fit
      • 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


      Sound Level Ideal for Street Driving. The Flowmaster Force II Cat-Back Exhaust is great for street driving. Flowmaster’s Delta Flow technology lets them calibrate the exhaust to deliver a mild to stock interior sound level while delivering a richer tone and moderate sound level outside. This lets you enjoy all the performance benefits of a Flowmaster exhaust without disturbing the neighbors.

      Significant Performance Improvements. Flowmaster’s patented Delta Flow technology is designed to improve scavenging. In combination with the mandrel-bent tubing’s smoother exhaust flow, it improves the Silverado’s throttle response, power, and mileage.

      304S Stainless Steel Construction.
      The Force II Cat-Back Exhaust is made from high-grade stainless steel for durability and longevity. Additionally, the polished stainless steel tips give the exhaust a good-looking finish.

      Designed for Easy Fit. The Force II Cat-Back Exhaust is specially designed for its application and uses factory mounting points to further simplify the installation. It can be configured with either dual side or dual rear exits. Flowmaster recommends welding the slip-fit connections for a more secure installation.

      Application. The Flowmaster Force II Cat-Back Exhaust with split side or rear exit is designed to fit 2014 to 2018 Chevrolet Silverado 1500 5.3L models equipped with Double or Crew Cab. It’s not compatible with 2WD Crew Cab models with 2-piece driveshaft.

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      Fitment: 2014 2015 2016 2017 2018 Details

      Flowmaster 817666

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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Inlet Pipe
      • (1) 6.5 ft. 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

      Customer Reviews (100+)

        Questions & Answers

        10 More Questions

        Will It Fit My Silverado 1500

        • 4.3L V6 - 14, 15, 16, 17
        • 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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