MagnaFlow Cat-Back Exhaust Kit Competition Series 3" Stainless Steel GT 2015-2017

94% of 100


  • Dyno Proven Increases
  • 3" Competition Series Cat Back
  • Dual 4.5" Polished Tips
  • Race Inspired Exhaust Note
MSRP $2,423.01
You save 37%

MagnaFlow Stainless Steel 3" Competition Series Cat-Back Exhaust Kit for all 2015, 2016 and 2017 GT Mustangs.

The stock exhaust system on your 2015-2017 GT Mustang works well, and it even gives you a nice muscle car roar. But when you really want the best in performance, efficiency, and volume, the MagnaFlow stainless steel cat-back exhaust system delivers what you want and then some.

This MagnaFlow exhaust system includes bolt-on parts that use the same mounting points and brackets as your stock exhaust, which makes it a breeze to install. And because it’s loud, it’s also a great way to show off the V8 that you have under the hood! Looking for a way to make your 2015-2017 GT Mustang sound as fast as it really is? This Stainless Steel 3" Competition Series Cat-Back Exhaust Kit from MagnaFlow is going to provide the aggressive, head-turning roar that you're looking for.

MagnaFlow Cat-Back Exhaust: Loud, Powerful, Easy to Install

This MagnaFlow cat-back exhaust system uses a free-flow X-pipe mid-section to safely siphon exhaust away from the engine while delivering a deep, satisfying roar. The 3” pipe sections offer a lot of space for your exhaust to flow, giving your pony car better performance and a sleek, efficient system to match. The end tips cap off your exhaust system with a smart, sleek, and modern appearance as well.

The MagnaFlow cat-back system comes with three durable and reliable pieces that you can quickly install on your pony car. The pipe sections slide on to stock hangers and sleeves easily.

Features and Benefits:
- Made From 3" Stainless Steel Mandrel Bent Tubing
- Dyno Tested and Proven to Increase both Horsepower and Torque
- 4-1/2" Polished Stainless Steel Tips
- 5" Round Competition-Style Mufflers
- Aggressive Race-Inspired Exhaust Note
- All Welded Construction and Built To Last
- Easy To Install

This MagnaFlow Stainless Steel 3" Competition Series Cat-Back Exhaust Kit is sure to transform your Mustang's exhaust note into the thunderous sound it’s meant to have. With maximum performance in mind, MagnaFlow designed this Cat-Back Exhaust Kit for reduced mass to get your Mustang down the dragstrip that much faster. And with the prestigious MagnaFlow name, you know these parts are built to last with all mandrel bent tubing and precise fitment around the brand new 2015-2017 Mustang’s independent rear suspension.

This system is a complete kit, including all the necessary mounting hardware for installation. This MagnaFlow kit mounts in all of the factory exhaust mounting locations and exits through the rear valence. The 4-1/2" polished stainless steel tips also fill up the exhaust cutouts much better than the stock muffler tips. The Competition Series Mufflers included with this kit provide a race-inspired sound that will be sure to turn heads whether you're cruising down the highway or getting ready to make a shakedown pass at your local dragstrip.

MagnaFlow has been making aftermarket exhausts for Mustangs for decades, and this system is simply one of their best. Plus, at such great prices, you can be sure you’re getting a great deal on your Mustang’s new exhaust when you shop here. We can even ship most orders on the day you place them for free too, just to make sure you can get the products you need without emptying your wallet!

Order a MagnaFlow Stainless Steel 3" Competition Series Cat-Back Exhaust Kit for your 2015-2017 GT Mustang from CJ Pony Parts today!

California Residents: Proposition 65 Warning

Installation Difficulty


Novice skill is required for this installation.

Installation Videos

Video Transcript

One of the first modifications most Mustangers do to their car is a new exhaust system. We don't expect the 2015 owners are going to be any different. While the factory system doesn't sound bad, it's kind of on the restrictive side. Inside the car, you can barely hear it. Today we're going to remove our factory exhaust system and replace it with this Competition cat-back from MagnaFlow.

The Competition cat-back from MagnaFlow is going to be a bolt-on exhaust. It requires no cutting to install. It's a full three-inch system made of stainless steel. It uses an X plate, leading through a set of straight-through style mufflers, with a set of four-inch polished tips. This system is designed to be aggressive sounding, give your Mustang a really unique sound.

Before we begin the installation, we'll start off with some sound clips of the factory exhaust. (car exhaust sounds) Not bad for a stock system, but we can definitely do better.

For this installation, we need a lift or a jack and jack stands, 3-inch ratchet, 13-millimeter deep socket, 15-millimeter deep socket, 6-inch extension, and safety glasses.

We're going to start by giving you an overview of the factory exhaust system on the '15 before we install our cat back. Starting off here, we have our factory catalytic converters, look similar to previous years, the difference being here, on the driver's side, the catalytic converter and header is all one piece. They make it unique to add an off-road system, but there will definitely be ways to do it in the future.

Back here, this is where our cat back is actually going to install. That's a good thing, because it gets rid of this. This is a large resonator. It's definitely going to produce, slow down the flow of the exhaust, kill the sound. It has a lot to do with the weight of the exhaust system, as well. Finally, we go back to a set of tailpipes which now go under the axle, because we have an IRS instead of a solid axle, and a set of standard-looking Ford mufflers.

We'll begin the cat back installation by removing the two sleeves that hold our factory cat back to our factory H-pipe. I'll just pull this tab out here, and we'll slide the clamp back. Once the clamps are loose, screw in the hangers for the tailpipes.

For the next step, you want a little bit of help. The last two hangers are located here for the mufflers. The whole exhaust system, though, will have to actually slide back to get off the H-pipe, and then go forward to get off the hangers. You'll definitely want an extra set of hands, because the whole exhaust is welded and it's quite heavy.

You'll need to get four pieces off the factory cat back we're going to use for our new installation. First is the sleeves up here. You also need both factory rear hangers.

We'll start the installation of our MagnaFlow cat back by reinstalling the factory sleeves on the H-pipe. Get them over the factory studs, then grab your MagnaFlow X. Put the X-pipe up into place. Now we're just going to snug these up. You don't want to tighten them all the way. Just get them tight enough so the X-pipe doesn't move.

Now we'll start with the tailpipes. You want to put a clamp on it first. Then reinstall the factory hanger, making sure the hook is facing towards the front of the car. Now we'll snug the clamp up. This one you want real tight at all, because you will have to twist the tailpipe to get the muffler aligned properly. Just snug it up so it doesn't move.

Once you have the tailpipes in place, reinstall the bolts on the factory hangers. That's the last clamp on the muffler. You want to leave them loose enough so you can bend it into place. Get the tip where you want it, and tighten down.

And your installation's finished. Now the part I was waiting for. Let's see how it sounds. (car exhaust sounds)

Now we'll take it for a drive with our MagnaFlow Competition on it. First thing you notice when you start the engine, the MagnaFlow's got a real deep tone, so you'll really feel it inside the car.

Our MagnaFlow Competition series cat back fit the car great, it looks great, but best of all it gave us that aggressive MagnaFlow tone we've come to know and love on all their systems. Installation's pretty straightforward, probably only take you around an hour. You'll be back on the road in no time.

Vehicle Fitment

This product will fit the following Mustang years:

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