Install Guide: 2015-2017 Mustang Roush Axle-Back ExhaustLast Updated September 23, 2016
Roush Axle-Back Installation For 2015-2017 GTs
The Roush Axle-Back was one of the more popular systems for the 2011-2014 Coyote Mustangs, especially if you keep the rest of your exhaust system stock. It offered a very aggressive tone when on the throttle, but at highway speeds it was tame and offered no drone at all. When Roush Performance announced a similar system for the 2015 Mustang, we knew we had to get our hands on one. So, today we're going to show you how to install one on your 2015 GT.
Note: For those with S550 EcoBoost or V6 Mustangs, installation is virtually the same process.
CJ Installation Video
- Lift or Jack and Jack Stands
- 1/2” Ratchet
- Low Torque 1/2” Impact Gun
- 15mm Deep Socket
- Safety Glasses
Installation Time: ~1 hour
1. The instructions provided by Roush tell you to cut the pipe closest to the tangent of the curve. The tangent is the closest straight line to the curve of the pipe. You want to follow the curve over and as soon as it gets to a straight section; that's roughly where you're going to cut. Do the same thing on both sides.
1a. Tech Tip: We recommend doing one side at a time in case you need to reference the other side during installation.
2. To make sure you're in the right neighborhood, grab the Roush muffler. You're going to hold it up approximately where it's going to go. Then make sure this lines up with where you're going to cut.
3. Once you see that everything lines up well, you can cut the pipe.
3a. Tech Tip: Since you'll need two hands to control the saw, if you don't have someone to hold the pipes for you, stuff some rags around the tip. That way, it doesn't bounce up against your valance.
4. Now you can slide the muffler off the factory hanger. Then you'll want to de-burr it before we put the new pipe on.
5. Now you’re ready to slide the new Roush Axle-Back Muffler into place. With the clamp slid into place on the muffler pipe, make sure it's a spot where you can reach in to tighten it. You’re now going to put it up into the hanger the opposite way you pulled the factory muffler out and slide muffler pipe over the factory intermediate pipe.
6. Grab the supplied tips that are fully adjustable in this case. Slide a clamp on, and make sure you get it where you want it. You can push it all the way down and bottom it out, but it typically looks a bit better if the tip is flush with the valence.
7. Once the tip and piping aligned correctly, go back and tighten both clamps down.
7a. Tech Tip: Roush recommends against using an air impact for this part of the job. Use a hand tool, or a cordless, battery powered low torque impact gun like Bill’s.
8. Repeat the process on the other side and your installation is finished!
Some Notes On The Exhaust Note/Drone
Inside the car, the tone is very similar to the 11 through 14. It has that same kind of aggressive sound to it, but it's quieter. We actually don't think the exhaust is quieter, it's just that the 2015 is actually much quieter inside so we think it's deadening a lot of the sound out. When you're at highway speeds, you can't even hear it. No drone, no nothing at all. But, when you downshift and get on it, you’ll hear that nice aggressive sound we're all used to from Roush mufflers.
That Roush sound that was so popular with 2011-2014 Mustangs is alive and well for the 15 too. It sounds nice and aggressive when you get on it, but on the highway it's real mild and no drone whatsoever. Installation is also pretty straightforward. Probably take you only around an hour.
Mustang GT Roush Axle-Back Sound Clips
Mustang GT Roush Axle-Back With Resonator Delete Sound Clips
Mustang EcoBoost Roush Axle-Back Installation & Sound Clips
Mustang V6 Roush Axle-Back Installation & Sound Clips
There's no doubt that the factory exhaust that comes on the 2015-2017 Mustang GT is quiet, restrictive and overall boring. That's where the Roush Axle-Back from Roush Performance steps in to provide better exhaust flow with a straight-through racing style muffler and an aggressive, throaty exhaust note. Find out how to install it in this guide!
An axle-back system is great for those who are looking for that throaty exhaust note, aren’t as concerned with power gains and would like a reduced price point. A cat-back on the other hand, is for those who may plan on doing headers in the future, want a customizable option with an X or H pipe and want full power benefits from an exhaust system. Now that you know the difference between an Axle-Back and Cat-Back, you have the knowledge at hand to make an educated decision about the direction of your Mustang build’s exhaust system! Check out the CJ Pony Parts website for all of your Mustang’s exhaust needs!
Get that perfect exhaust note out of your V6 with a dual exhaust conversion kit from CJ’s. With the knowledge at hand from this tech article and the proper tools and parts, installation will be a breeze and you’ll be back on the road in no time! So, be sure to check out our selection of Mustang exhaust parts on our website today.
2011 was a monumental year for Ford, Ford Racing and the S197 platform. This year in particular introduced an all-new 5.0L “Coyote” V8 with twin-independent variable camshaft timing pumping out a nasty 412 horsepower and 390 lb/ft of torque, which was then bumped to 420 for 2013-2014 GTs. Compared to the 2010’s outgoing 320 horsepower, this was quite a jump in power for nearly the same price. After picking up your new pony, the next step is always a good sounding exhaust system!
For many Mustang owners, it’s about getting that perfect exhaust note, which can be very subjective. However, time and time again, many of our customers can agree that the Roush Performance Axle-Back is one of the best sounding Axle-Back systems out there for these cars.