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Roush Axle-Back Exhaust (15-17 GT)

Item 387039
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    Features, Videos & Details

    • Aggressive Exhaust Sound
    • Unique Open-Chambered Muffler Design
    • 304 Stainless Steel Construction
    • Full Mandrel-Bent Tubing
    • 4" Round Stainless Steel Tips w/ Chrome Flashing
    • Fits All 2015-2017 GT Mustangs

    Review & Installation Video

    What's up everybody? Justin with Welcome to my quick breakdown of the Roush axle-back exhaust system available for your 2015 Coyote powered GT. As you guys all just heard, the 2015 Roush axle-back definitely lives up to the claim of being one of the more aggressive axle-back systems available for your new GT. The same was true with the '11 to '14 S197 axle-back, and that same super aggressive tone has definitely found its way over to the new S550 kit.That super angry or aggressive tone does come courtesy of Roush's unique open chambered or hollow chambered mufflers as they call them. These things are unique in the fact that they don't use a traditional fiberglass packing material. This allows for that really aggressive tone you guys heard earlier. At the same time, it's going to keep any interior noise or drone to an absolute minimum. In addition, these mufflers are a straight through design, meaning any performance you might see, while minimal typically here with an axle-back, will definitely be a little bit more than what you might see with a traditional chambered muffler.All right, guys, going over the build quality a little bit here. You will notice what little piping there is has all been mandrel-bent two and a half inches in diameter. The entire system has been constructed from quality 304 grade stainless steel. This does include the four inch slash cut tips. These tips are cool because they do feature Roush's unique new chrome flashing process which they say will help reduce any discoloration over the years.By now, guys, you should know that with any 2015 axle-back install there is some cutting required. However, like I tell you in some previous videos, as long as you take your time and follow some basic guidelines you should be good to go. These guidelines do include making sure you have a nice fresh Sawzall blade on hand, make sure you wear your eye protection of course, and last but not least measure twice and cut once. Thankfully, Roush does include some really nice detailed instructions with this kit on where to cut. As long as you take your time, follow the instructions, you can expect to spend about two hours from start to finish getting this thing bolted up.If you guys are looking for one of the most aggressive axle-back systems from one of the most recognizable names in the Mustang world then be sure to check out the Roush axle-back for your Coyote powered GT right here at

    Aggressive Muscle Car Sound. Let your 5.0L Coyote engine howl with a Roush Axle-Back Exhaust. This innovative new Roush exhaust system features a hollow chambered muffler that results in increased air flow and a unique sound, with no in-cabin "boom" normally found with performance exhaust at cruising speeds.

    Quality Roush Construction. Constructed from mandrel bent 304 stainless steel for a durable long life, the Roush axle-back exhaust system features two unique open chambered mufflers with 304 stainless steel 4" tips. The 4" tips are finished with a brand new chrome flashing process that is resistant to discoloration due to exhaust heat.

    Cut & Clamp Installation. The installation of this Roush Axle-Back Exhaust requires cutting and removing the factory muffler assemblies and clamping the new muffler assemblies in place. Clamps and instructions are provided.

    Application. This Roush Performance Axle-Back Exhaust System is designed to fit the all 2015-2017 GT Mustangs, including Fastback and Convertible models, for both great looks and great sound.

    Fitment: 2015 2016 2017 Details

    MPN# 421834

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Muffler assembly - Driver Side
    • (1) Muffler assembly - Passenger Side
    • (2) Tips
    • (4) Clamps
    Installation Info
    Tech Specs
    Cat-Back Exhaust Specifications
    Piping Material:304 Stainless Steel Tip Material :304 Stainless Steel with Chrome Flashing
    Piping Size:-"Tip Size:4"
    Muffler Type:Open chamberedFitment:2015-2017 GT
    Will it fit my Mustang?

      Customer Photos (100+) Submit Your Photo

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        Questions & Answers (57)

        5 Top Rated Questions

        Bought a 2017 GT Fastback in December (2017) Will installing these or any aftermarket axle-back mufflers affect my five year warranty from Ford?

        • We suggest reaching out to the dealership to see if the Roush Axle-Back Exhaust will affect the warranty.

        Helpful (12)

        I have an 11 month old son, will this be too loud for him in the back seat? I also have a 2006 with a bunch of work done to it and it is too loud for him to ride in so when my wife and I go to shows I need this to be noticeable louder but yet not too loud for my son. Thanks.

        • Hello! Unfortunately loudness is totally subjective to each person, as far as exhaust systems go, an axleback is the more quiet option. However, Roush is one of the louder axleback exhaust systems. I would recommend trying to find someone local with an axleback setup on their mustang, so you can hear it in person to decide.

        Helpful (6)

        will this fit 2015 GT convertible?

        • This will fit with the 2015 GT convertibles.

        Helpful (6)

        I will have this set for my mustang gt 10/12/17,my question is what is in the inside of these mufflers.

        • The mufflers in the Roush Axle-Back Exhaust will contain Roush's proprietary sound deadening materials to enhance the exhaust note of your Mustang.

        Helpful (5)

        Are these Roush axle back exhaust legal in the state of California?

        • We recommend that you check with your local ordinances to determine if their are any decibel limits, but in terms of emissions you'll have no issues. When it comes to the exhaust, if it's not catalytic converters or headers, you won't have to worry about emissions.

        Helpful (3)
        10 More Questions
        Will this exhaust pair nicely with the Mishimoto H-pipe? I see all of the pairings going with an X pipe, but I really want that low pitched muscle rumble. 1 answer
        I have 2 3 years warranty for my Mustang GT. Is there any warranty issue if I would modify the original exhaust system? 1 answer
        Hi I have a 16' GT Convertible. I love my car, but I want some more sound. I am looking for the deep rumbling sound, not the screaming one. Will Roush Axle-Back Exhaust be the right way to go? As of now, I don't want to spend to much money, just want some more sound. Down the road I am also thinking of getting a Roush Supercharger. (727 hp) Will this setup still be okay if I am getting the Supercharger? Does black tips exist for this ? 1 answer
        will this muffle system void the ford warranty 1 answer
        Any drone heard with this Axle-Back and an X-Pipe? 1 answer
        Does anybody have any suggestions of which x pipe to pair with this axle back? 2 answers
        I know the outlet diameter of the tips is 4.5", but what is the diameter of the inlet (where the tips attach to the muffler)? 1 answer
        Did you measure your product for 95db max at 3000rpm 25 inches away at a 45 degree angle yet? If not I need to order from another manufacturer. New California law. If you comply I’ll buy your product. 1 answer
        My 2016 GT is a convertible With top down could this add on be to load 0 answer
        I have single tip roush axle back installed to my car. I was planning to change it to quad tip. Is there may quad tips to fit this exhuast? 1 answer

          Customer Reviews (100+) Write a Review

          Ratings Summary

          4.9 out of 5 overall rating from 100+ customers

          Installation Time: Afternoon

          Installation Cost: $100-$250

          • January 01, 2020

            1 2017 GT - RWS28


            Ordered the Axle back for my 2017 GT REALLY disappointed when I opened the box and there was quad tips inside which can only be used with a 350 diffuser. Been waiting 3 days to hear if they will send me correct parts. Spend this kind of money and shouldn’t have to wait for clarification.

            Helpful (0)
          • November 16, 2019

            5 2015 GT - KimH7609 Installation Time: Less than 1 Hour

            Roush axle back

            I love it! Car sounds as good as it looks now!!!!!!!!!!!!!!!!!

            Helpful (0)
          • October 14, 2019

            5 2016 GT - Toufic Installation Time: Less than 1 Hour

            It sounds like a mustang should ! I love it best bang for your buck!

            Helpful (0)
          • September 17, 2019

            4 2017 GT - Justin Installation Time: Afternoon

            She really barks now!

            So I installed this axle back along with Roush's H pipe and the combination have made my car really bark and growl on a cold start and have a nice mellow (yet menacing) rumble when warm and idling. There is a install and review video available for this mod and the car in that video will give you a real good idea of what your car will sound like with these mufflers and H pipe. My only complaint is you have to download instructions from Roush and in the instructions it does not give you a exact dimension to cut your factory tailpipes (as you will reuse what is between the resonator and the new mufflers) and you have to trim a section off at the rear of the pipe to install the new mufflers. So guesstimate on the long side and just trim off small chunks until you get it just the right length. Other than that the install was fairly straightforward and has given my car a new personality!

            Helpful (1)
          • August 24, 2019

            5 2019 GT - kenneyb Installation Time: Less than 1 Hour

            You won't be sorry!

            Very easy install. I am no mechanic but can use a Sawsall and follow directions. Watched 3 Youtube videos including the AM one. Didn't need to jack up the car. I started the Mustang after and giggled like a little girl. Best money I ever spent on upgrades. Not too loud or obnoxious with the cats still intact. You're gonna love it!

            Helpful (1)
          • August 10, 2019

            5 2015 GT - AlejandroC Installation Time: Less than 1 Hour

            This best of the best

            No doubt in my mind these are the best on the marked roush is just out of everyone’s competition when it comes to exhaust

            Helpful (0)
          • August 06, 2019

            5 2015 GT - Fordman2015 Installation Time: Less than 1 Hour

            Love the sound

            This exhaust brings my 2015 gt too life ! It's not too loud or over powering!

            Helpful (1)
          • July 30, 2019

            5 2015 GT - Jkimbro95 Installation Time: Afternoon

            Roush axle-back

            Exhuast sounds amazing, and is easy to install. Great if you're looking for a quick and easy way to get better sounding exhaust.

            Helpful (0)
          • July 22, 2019

            5 2015 GT - Tswitherington

            Exactly what I wanted

            Sounds great, not too loud. Exactly like in the video. Would recommend.

            Helpful (0)
          • July 16, 2019

            5 2016 GT - Marc Installation Time: Afternoon

            Great also on convertible

            With hood up you can hear the exhaust clearly. As in the video at cruising speed (no acceleration) the exhaust is as stock, BUT hit the gas and that thing gets loud. Also with hood up.

            Helpful (0)
          • July 13, 2019

            5 2015 GT - Tony Installation Time: Less than 1 Hour

            It won’t disappoint!!!

            My ORM exhaust on my 5.0 sounded ok, but I wasn’t satisfied. So I installed an x-pipe. I knew it would be a little more raspy, but I thought it had to sound better than OEM. Therefore, I decided it needs something more. I wanted something with a deeper growl. I searched and searched but couldn’t find anything that totally satisfied me. I didn’t want to settle. Then I came upon the Roush Kit. So I bought and installed it. I’m in love with the deep rumble. It’s the perfect sound. It’s loud enough any muscle car enthusiast, but won’t rattle the neighbors’ windows. It’s a great choice. It won’t disappoint!!!

            Helpful (0)
          • July 09, 2019

            5 2015 GT - Stangthang Installation Time: Less than 1 Hour

            Love it

            Love the roush axleback for the 5.0. Perfect sound level and quality.

            Helpful (0)
          • May 30, 2019

            5 2015 GT - HoserHoss Installation Time: Afternoon


            Easy install ( 2 hours taking my time ) and the sound I was wanting

            Helpful (0)
          • May 24, 2019

            5 2016 GT - Kyriej30 Installation Time: Less than 1 Hour

            Roush axle back

            Sounds great on cold start. Sounds deep on idle. Sounds aggressive on acceleration.. Well made. Just what I was looking for.

            Helpful (1)
          • May 21, 2019

            5 2016 GT - MikeE Installation Time: Less than 1 Hour

            Great Exhaust, Highly Recommend

            The stock exhaust was too tame for me. I had a 2004 Mach 1 with Flowmasters on it that woke the neighbors (they love me). When I got my '16 GT I missed the rumble of the V8 that made it sound like a muscle car. Did my research and decided on the Roush Axle Back, since you can't put cat-back on a convertible without removing bracing. Simple install, maybe an hour and a half (and that's only because I was messing around with the look to make sure it was perfect) and it turned into a monster! Love the sound, very aggressive when it needs to be (full acceleration), but also tame enough that it doesn't bother my wife when we're just cruising with the top down. Would absolutely recommend!

            Helpful (2)
          • May 21, 2019

            5 2016 GT - AL Installation Time: Shop Install Installation Cost: 0-$100

            Money well spent

            I love the new sound, aggressive, mean and big different from the previous one on my 2016 GT. I would recommend it to any mustang enthusiast. I had mine install at a local shop and it them less than an hour to do. It's worth the cost.

            Helpful (1)
          • May 15, 2019

            5 2017 GT - joesv6 Installation Time: Less than 1 Hour

            Great sound

            System very easy to install took less then an hour, very aggressive sounding exhaust. Recomend to anyone wanting an aggressive sounding stang

            Helpful (0)
          • May 15, 2019

            5 2016 GT - DaylinD


            Sounds great. I would recommend getting an H-pipe to go along with this, opens the car up so much more.

            Helpful (1)
          • May 08, 2019

            5 2017 GT - Jdanhour Installation Time: Less than 1 Hour

            Roush exhaust

            This item is loud and is easy to install. If you are looking for clean crisp exhaust with no drone this is a good one.

            Helpful (1)
          • May 08, 2019

            5 2017 GT - Michael

            Absolutely Perfect

            my dad got this installed for his 17 GT in March. Sounds absolutely incredible now. he has had it for about 1000 miles. Louder on cold starts, but nowhere near unbearable. If anything, I would go louder. Absolutely no drone when cruising, quiet on the inside. Can be kept stock quiet if you shift at 2.5k rpms. If you see any of the other reviews stating it's too loud, its not at all. This is hands down one of the best exhausts to choose from. Cheap and has everything you want

            Helpful (0)

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