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Flowmaster Outlaw Dual Exhaust System; Side/Rear Exit (09-13 5.3L Silverado 1500)

Item S104237
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      Video Review & Installation

      So if you own '09 to '13 5.3 liter powered Silverado and basically you want one of the loudest cat-backs available for your truck, you should be checking out the Flowmaster Outlaw dual and side rear exit cat-back that I've gone on the truck behind me. This system is gonna be Flowmaster's loudest available system that they still consider street-legal. And for that reason, it gets a strong five out of five on my one to five or one to wake the neighbors scale. What's really nice about this system is it does not require any cutting or permanent modification to install. And even though your truck might be a factory single side exit, Flowmaster is kind enough to provide some new hardware so you get this cool split side or rear exit configuration that you see behind me right now. Now what I also like about this system is it's all 409 stainless. So that's factory quality steel. If your truck is a daily driver or you live on the East or West Coast, you get a lot of bad weather, it's safe to say this system is going to hold up quite well. Now, popular opinion does say that thanks to the Delta series 10 muffler that this kit comes with, this system might actually be a bit louder than a straight pipe setup which is impressive to say the least. However, from personal experience, full disclosure, I've got the Outlaw on my vehicle, I can say that it is by no means a sloppy or gargly sound like a straight pipe setup. The 10 series muffler is still baffled and chambered so it actually tunes the sound pretty well, and for that reason, it does not provide that much cabin drone for how much volume you are getting out of this kit. For all those reasons, I think it is a top pick for the 5.3 motor, really gives it that classic street rod or muscle car sound, if you will. So if you like the way it sounds and you wanna see how the install goes, stick around. I'm actually gonna show you every single step here step by step. It's gonna be a one out of three wrenches on my difficulty meter. You should be able to get this done at home in about an hour or two. To install your Flowmaster cat-back, you will need the following tools: a quarter inch drive ratchet, a 3/8 drive ratchet, a 15 millimeter wrench, a 10 millimeter deep socket, a 13 millimeter deep socket, and a 15 millimeter deep socket. Now optional but helpful tools include some PB B'laster or spray lubricant, an impact gun, an exhaust hanger puller tool, a pry bar, and a dead blow mallet. So before we install our new Flowmaster, we have to remove the factory cat-back from our truck. Luckily, it's pretty straightforward. The entire system actually comes off as one piece. All you gotta do is pull all the factory hangers out of the rubber isolators and you have to pull the band clamp which connects the Y-pipe to the mid pipe. So, let's go ahead and get started. So that clamp I was talking about is located right here next to this flex fitting. Normally, you'd be removing this clamp using a 13 millimeter socket. But as you can see, our truck has seen some better days in terms of weather. So our clamp is pretty much rusted together. We're actually going to use my favorite tool and we're gonna cut this clamp off. But I'll show you what the clamp looks like after we're done so you can see how you would normally loosen it. So as you can see here, the fastener was pretty much welded together with a little bit of rust. But like I said, if your truck is not suffering like ours is, you can use a 13 millimeter socket to pull this thing loose. All right. Now that the mid pipe is free from the Y-pipe, the next step is pulling the exhaust from the rubber isolators and the hangers. There are four in total, one in front of the muffler, two directly behind the muffler, and one over the tailpipe. It's good to have some lubricant because these are rubber. So once you spray them down, it'll make pulling them out a lot easier. All right. Now that our factory cat-back is free from the vehicle, we're gonna actually remove it. It's pretty straightforward. You can do it by yourself as long as you're careful. What you're gonna wanna do is push the entire cat-back towards the rear of the truck enough so that the mid pipe will fall from the crossmember near the transmission. Once that falls down, you can pull the entire system out. Now that you got the factory cat-back removed from the truck, it is a good idea to mock up your new system. This way you'll know which pipes go where, because let's face it, when everything's in the box, it kind of looks like a jumbled mess. Now that we have our system put together here, I wanted to go over a few things with you real quick, maybe answer some questions you might have had. First thing's first, this is the Delta Flow series 10 muffler and you can see obviously how much smaller it is than this giant factory box. That's really gonna be responsible for providing that five out of five on that loudness meter. But unlike straight pipe systems, again, this still is a baffled and chambered setup. So it's still gonna give you a nice tune sound. It's not gonna sound too gurgly or throaty. Now, if you were curious, your factory cat-back is two and three-quarter inches from the muffler all the way to the tip whereas the Outlaw system is three inches throughout. So that's gonna really be responsible for giving you those nice deep tones when you're in the low and mid-range of the RPM band. Besides that, again, you can see how much nicer the mandrel bent pipes are on this setup, a lot more free-flowing, and you're still getting factory grade 409 stainless. So it's safe to say, even if your truck is a daily driver or you drive on the East or West Coast and you get a lot of bad weather, this thing will definitely stand up to the test of time. What I also really like about this system, again, there's no cutting required. So install's pretty straightforward, and it does reuse all your factory hanger locations. Now, regardless of which setup you go with, because again, this is that dual exit exhaust, you can pick either side or rear exit, the system does come with a new hanger for the driver's side. It's really easy to get that hooked up. Even if your truck doesn't have one, the kit comes with all the provided hardware. So without further ado, let's go ahead and throw the system on the truck and I'll show you how to install those new hangers. All right. The first step of installing our new cat-back is throwing on our new mid pipe. Before you do that, you're gonna wanna take a look at the instructions and depending on your cabin bed length, you're gonna wanna throw one of the provided hangers on to the mid pipe. You want it oriented so that the hanger itself is towards the passenger side of the vehicle. You're gonna throw this into the rubber isolator up here and you're gonna take the flared end and secure this to your factory Y-pipe. We went ahead and replace the clamp that we had to cut earlier and that's gonna be a 13 millimeter socket. Now as you can see, I tightened down the clamp here just enough to keep the mid pipe in place. You wanna have a little bit of movement in here that way when you're putting on the rest of your cat-back, you can play around with fitment and make sure none of the pipes or hangers are actually rubbing against anything on the vehicle. All right. With our mid pipe hung and in place, we're gonna install our muffler. We wanna make sure that the single inlet of the muffler is on the mid pipe itself and then the two outlets are gonna be for your flow tubes out to your exhaust tips. Gonna grab one of these clamps here provided with the kit and you're gonna tighten it down using a 15 millimeter socket. All right. Now that we have our muffler installed and tightened down, it's time for us to install the rest of our cat-back. I'm talking about the over axle pipes, the tailpipes, and the tips. Before we do that, we gotta throw two band clamps on the outlets of the muffler here. And at this point, it's a good idea to have the muffler in the correct location. You can either have a friend help you or if your truck's on the ground, you can use a floor jack. Our truck is obviously up on a lift so we have a pole Jack. This is gonna mock up where the muffler is gonna hang that way when we install the flow tubes, the new hangers are gonna fit into the rubber isolators without us having to struggle. All right. With those clamps thrown on the outlets of our muffler, we're gonna start installing those over axle tubes that I was talking about. We're gonna start with the passenger side. You're gonna wanna make sure you line it up so that both hangers fit in your factory rubber isolators. All right. With that over axel pipe in place, you wanna make sure it's nice and snug inside the muffler. And you're gonna throw this second isolator on the hanger here then we're also gonna tighten down this clamp. Again, this is a 15 millimeter socket. All right. Now that our passenger side over axle tube is installed, we're gonna go ahead and install our new tailpipe with our exhaust tip. Now you're gonna grab one of the 15 millimeter clamps in the kit and you're gonna tighten this down a fair amount but not all the way, because once we get both sides installed, we wanna play around the fitment a little bit, make sure both of our exhaust tips are lined up and level with each other. All right. Now that our passenger side is all set up, it's time to do the same thing to the driver's side. Now the over axle pipe for the driver's side is a bit of a tight squeeze so it's actually split into two pieces. We're gonna start with the first half and it's gonna be the same deal. We're gonna put this hanger in the factory rubber isolator just behind the muffler and we're gonna tighten the pipe to the muffler itself. So now that we have the first part of our driver side over axle pipe installed, we're actually gonna install the new hanger before we put the second part of the over axle pipe in place. To do that, you're gonna grab the hanger with the red rubber isolator in the kit and you're gonna set it up like so. You have the metal bracket on the hanger itself on the outside of the frame and you have this other little metal bracket on the inside of the frame. The reason for that is the hole you're putting this through is not actually round. So these two metal plates are gonna keep the hanger in place. They're gonna stop it from bending and getting all out of whack. You're gonna set it up with the provided 15 millimeter bolt as well as the flat washer. And on the other end, you're also gonna use a 15 millimeter nut. All right. With our new hanger installed with the rubber isolator, we're gonna install the second half of our over axle pipe. It's gonna be the same process as all the other ones so far. Gonna take one of your 15 millimeter clamps, place it over the flared end, and then you're gonna insert it into the first half of that pipe we just installed. All right. Now that our driver's side over axle pipes are in place, the last step of this side is putting on the tailpipe with the exhaust tip and another 15 millimeter clamp. All right. Now that we have both sides of our cat-back in place, we're gonna play around with fitment a little bit, make sure we have both of our exhaust tips lined up where we want them and then we're gonna start tightening everything down. Again, all the clamps are 15 millimeter sockets, and we're gonna go from front to back. All right. So we tightened down all the clamps on our cat-back and we've made sure that our tailpipes are exactly where we want them. The last step is leveling out the tips themselves, and you're gonna tighten those down with a 10 millimeter socket. Now, you might need a 10 millimeter wrench for the other side, but the bolt head should grab the clamp on the tip itself. So if you're lucky and you go slow, you should just need the socket itself. So as you can see, the Outlaw system does bolt up quite easily like I said earlier. And that actually wraps up my review and install of the Flowmaster Outlaw dual exhaust cat-back fitting your '09 to '13 5.3 liter powered Silverado. I'm Travis. Thanks for watching. Keep it right here at

      Product Information

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


      • Aggressive Race-Level Sound
      • Significantly Improves Horsepower and Torque
      • Delta Flow™ Series 10 Muffler
      • 3-in. Mandrel Bent Stainless Steel Tubing
      • 4-in. Black Ceramic Coated Exhaust Tips
      • Split Side or Dual Rear Exit
      • Designed for Easy Fit
      • Designed for Extended and Crew Cab Models
      • Fits 2009 to 2013 Chevrolet Silverado 1500 5.3L Models


      Maximum Sound Levels. The Flowmaster Outlaw Cat-Back Exhaust is designed to deliver the maximum aggressive sound level inside and outside the cab. It’s ideal for enthusiasts who want the most aggressive-sounding truck while enjoying the renowned performance benefits of a Flowmaster exhaust.

      High-Performance Exhaust. The Outlaw utilizes Flowmaster’s patented Delta Flow technology which helps improve scavenging. Combining the Delta Flow with the smoother exhaust flow of the mandrel-bent tubing results in a significant increase in the Silverado’s performance.

      High-Quality Construction. The Outlaw Cat-Back Exhaust is made from high-grade stainless steel and is built to last. Additionally, the black ceramic coated tips add a rugged finished look to your truck.

      Straight Forward Installation. The Outlaw Cat-Back Exhaust is designed for an easy fit to the specific application. Additionally, it comes with the necessary parts for either a split side or dual rear configuration. 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 2009 to 2013 Chevy Silverado 1500 5.3L models equipped with Extended or Crew Cab.

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      Fitment: 2009 2010 2011 2012 2013 Details

      Flowmaster 817688

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Inlet Pipe
      • (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

      Tech Specs


      Customer Reviews (100+)

        Questions & Answers

        10 More Questions

        Will It Fit My Silverado 1500

        • 5.3L V8 - 09, 10, 11, 12, 13

        Designed for Extended and Crew Cab Models.

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