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Roush Axle-Back Exhaust (18-20 GT w/o Active Exhaust)

Item 404877
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    Features, Video & Details

    • Aggressive, Raspy Exhaust Note
    • Unique Open-Chambered Muffler Design
    • 304 Stainless Steel Construction
    • Full Mandrel-Bent Tubing
    • 4" Quad Tips with Chrome Flashing
    • Fits 2018-2020 GT Mustangs Not Equipped with Factory Active Exhaust

    Review & Installation Video

    Review & Install Video

    Justin: If you're after one of the loudest and most popular axle-backs in the category for your 2018 and newer Mustang GT, the Roush should always be in the discussion. Now, the Roush axle-back will combine a quality 304-grade stainless build with blistering tone, all for around the mid $600 price point while the install will involve a small amount of cutting. So, therefore, we will knock this one up to a soft two out of three wrenches on the old difficulty meter here with a little bit more detail on that later in the video. So, ever since I can remember the Roush has been one of the most popular if not the most popular axle-back in the category for your S197 or S550 GT, V6 or EcoBoost. Figure a combination and quality fitment and tone make this a great or go to choice for a lot of owners out there, but if I had to pick one, I would say it's mainly because of the super aggressive tone coming from the unique hollow chambered Roush mufflers. So, segueing into my patented wake the neighbors scale portion of the video, the Roush is one of the easiest systems I've ever ranked at a strong four out of five on my one to five or one to wake the neighbor scale. A ton of volume and a slightly higher tone here with the Roush in place is what you can expect when bolting everything up. Now, keep in mind here gang I typically reserved the full five out of five ranking for full-blown cat-backs like the Flowmaster Outlaw or the Corsa Xtreme as they eliminate that factory resonator, but just know that if you do ditch that factory resonator here with the Roush axle-back in place in favor of an X or an H-pipe, you're certainly going to peg that scale. So, we know that the Roush is certainly a loud system in our sound clips back that up, but what else can you expect when going with this very popular axle-back? Well, this does utilize some very, very nice materials, guys, including the full 304-grade stainless steel throughout, including the small amount of two and a half-inch mandrel bent tubing, those open or hollow chambered mufflers, and then finally, everything will exit out the quad tips here, full stainless and polished to a nice shine. As far as your install is concerned, well again, there will be some cutting involved here but that will be the case with any axle-back for your S550. So, because of that, I will nudge this one up to a soft two out of the three wrenches on the difficulty meter here. Really not that bad as long as you take your time. And to give you a better idea of what's involved for this job, here is a detailed walkthrough along with a tool breakdown. Man: First thing we're gonna do here is make a mark on our cat-back that's gonna show us where we need to cut so we can remove the factory axle-backs. So, what we wanna do is find our muffler and come down right after the bend. As soon as the bend stops and you have a section of straight pipe, that's where we wanna cut. I'm gonna go ahead and make a mark here and we'll do the same thing on this side. You wanna find your bend. Right after the bend, you're gonna have a straight piece of pipe and we'll make our cutline right here. We're now ready to cut our factory axle-backs out of here. I got a metal cutting blade on my Sawzall. So, let's go ahead and get this guy cut. So, I'm about halfway through the pipe here. I did throw a pole jack up in place here so when I go all the way through this muffler doesn't come down and hit me on my head. All right. We've got our axle-back cut now. I'm gonna slide this stock muffler out of place. I'm gonna spray the upper hanger with a little bit of WD-40. Should able to just slide this right on out of our hangar. We're now ready to throw our new axle-backs up into place. I'm gonna start by putting a clamp on the end here. And we can get our hanger started in our rubber isolator. And from there, we'll just go ahead and get this pipe started back here. And we wanna make sure we bottom this out. We'll do the exact same thing on the left side of the car now. Start off by putting our clamp on. We'll get our hangar started and our rubber isolator and then we'll make the connection back here. And you wanna make sure that bottoms out just like that. And before we throw our tips on here, I'm gonna go ahead and get both of our clamps tightened. Have a 15-millimeter on my half-inch impact gun. Now, we're ready to throw our tips on. Again we wanna put a clamp on first. Slide our tip on. Get it positioned exactly where we want it and go ahead and tighten down this clamp. That's gonna wrap up our review and install. Be sure to check out more at

    Aggressive Raspy Sound. Designed for 2018-2020 GT Mustangs that are not equipped with the factory Active Exhaust, this Roush Axle-Back Exhaust will let everyone know you have arrived with its aggressive raspy sound. This innovative new Roush exhaust system features a hollow open chamber 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. Roush manufactures their exhaust systems from mandrel-bent 304 stainless steel for durability and corrosion resistance. This Axle-Back Exhaust features two unique open chambered mufflers that improve exhaust flow. The system includes two dual wall 4 inch quad tips that are finished in a new chrome flashing process that is resistant to exhaust heat discoloration.

    Cut & Clamp Installation. The installation of this Roush Axle-Back Exhaust will require 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 2018-2020 GT Mustangs that are not equipped with active exhaust from the factory.

    Fitment: 2018 2019 2020 Details

    MPN# 422097

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Driver Side Muffler Assembly
    • (1) Passenger Side Muffler Assembly
    • (1) Driver Side Y Exhaust Tip
    • (1) Passenger Side Y Exhaust Tip
    • (4) Clamps
    • Instructions
    Installation Info
    Will it fit my Mustang?

      Customer Photos (45) Submit Your Photo

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        Questions & Answers (11)

        5 Top Rated Questions

        What size pipe on these, 2 1/2 or 3'?

        • The tubing diameter is 2.5".

        Helpful (1)

        Can I just get the roush dual exhaust tip?

        • Unfortunately the Roush quad tips are not currently offered separately.

        Helpful (1)

        Will this fit a ‘17 GT with a quad diffuser?

        Are the tips actually 4 inches because I’ve heard they’re only 3.5?

        • Yes, the tips are 4" in outlet diameter.

        Helpful (0)

        Will these fit a “19 GT Premium convertible?

        • This will fit your vehicle, so long as it is not equipped with active exhaust.

        Helpful (0)
        Post Your Question
        6 More Questions
        Will these void your warranty in any shape form or fashion? 0 answer
        Will it pass CA emission requirements? 1 answer
        I have a 2018 GT.. I Don't have the active will this still work on my car? 0 answer
        Is this 2 1/2" tubing or 3inch? 0 answer
        Will this fit on the "16" GT Premium. I already have the Roush axle back single tip. Want to change to quads. 1 answer
        Your loudness level graphic shows higher for the black tip system than the chrome tip system. I assume these are the same mufflers and the two actually sound the same? What is so different on the black tip besides the price that makes it way louder on your loudness level?.....Thanks 1 answer

          Customer Reviews (48) Write a Review

          Ratings Summary

          4.8 out of 5 overall rating from 48 customers

          Installation Time: Afternoon

          Installation Cost: $250-$500

          • January 16, 2020

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

            19 Gt Review

            If you are in the market for a loud Axleback then Roush is the way to go. Sounds great and I love the tone. Especially when you downshift with the rev matching transmission...

            Helpful (0)
          • January 09, 2020

            5 2019 GT - TKD97 Installation Time: Less than 1 Hour


            This Roush exhaust is just what I was looking for. Awesome sound, not annoying and whimpy. Sounds great on start-up, acceleration and downshift. You can adjust the tips to stick out more or less.

            Helpful (0)
          • January 06, 2020

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


            I honestly was super hesitant about changing the exhaust on my base 2019 GT with the 6 speed manual. The stock exhaust on the base GT is admittedly very satisfying and much better than previous years. I was on the fence but after looking up a lot of example videos, I went for it. I am glad to say I was blown away by the sound. Even the throttle feels more responsive and it’s as if the engine doesn’t have to work as hard to exhale. It’s got a very tuned, almost exotic sound to the exhaust note that I enjoy very much. I can see why the Roush option is so popular. I don’t foresee myself getting an x-pipe though, this axle back is perfect. The exhaust is definitely louder, especially when you get on it, but it’s actually quieter at highway speeds (60-80 mph in 6th gear) than even stock. I enjoy this Roush setup a lot and I recommend this to anyone who daily drives their GT and just wants an exhaust note that’s more authoritative and attention getting but, totally manageable when you just wanna cruise.

            Helpful (0)
          • December 25, 2019

            5 2019 GT - Macdaddy097


            So I bought the MBRP x-pipe and the Roush axel back, let me tell you what it makes a huge difference! Cold starts it is really loud. Once it warms up and idles it actually gets pretty quiet. Droning at low rpms is a bit loud. But once you get on it, it sounds amazing. I personally recommend it for anyone who is interested.

            Helpful (0)
          • December 16, 2019

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

            A great product awesome sound .

            It was easy to cut and install the results are amazing I am really glad I did it.

            Helpful (0)
          • December 12, 2019

            5 2018 GT - BrandonE Installation Time: Less than 1 Hour

            Awesome aggressive sound when you hit the pedal

            It is aggressive when your foot is in the pedal. I have this with the cross pipe delete and I love the sound.

            Helpful (0)
          • December 10, 2019

            1 2018 GT - Agustin

            Processing time

            I bought the items 2 days ago and still showing as the order being processing, I wonder if I will get it before the end of this year.

            Helpful (0)
          • September 23, 2019

            5 2019 GT - ARodriguez Installation Time: Afternoon

            Aggressive, love the sound

            Very aggressive sounding, its quiet at lower RPMs, but cold start and when you get on it, sounds amazing, definitely want to go a bit louder, I would put this at a 4 for loudness in my opinion. H-pipe is next, can't wait! install did take a little longer than anticipated, also don't be afraid to use extra jack stands, may come in handy. o_O

            Helpful (0)
          • September 10, 2019

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

            Best exhaust ever!

            Second mustang installed on. If you want non factory exhaust, this is the one. If it isn’t loud enough add the x-pipe.

            Helpful (0)
          • September 01, 2019

            5 2019 GT - Tking08 Installation Time: Less than 1 Hour

            Sounds great

            Sounds awesome and it’s not too loud. Just what I needed.

            Helpful (0)
          • August 26, 2019

            5 2019 GT - coyotebreath94 Installation Time: Afternoon

            monster sound for the money with little drone

            Easy installation and everything lined up nicely . The sound is literally like a mountain lion growl -and purr. Very very beastly but with the shortcoming of a little drone between 1200-1800 rpms . Overall the sound makes up for the little drone suffered . Although many people say there is no drone , I read somewhere that it's the positioning of the tips the cause the BOOM or drone .I have to mess around the tip fitment to see if it goes away . However overall , like I mentioned above when you put the pedal to the metal the sound makes you smile hard! I just purchased magnaflows tru x -reaonated free flow x pipe to make it drone free and also get rid of the suitcase resonator that comes stock .. loving this new axleback

            Helpful (2)
          • August 16, 2019

            5 2019 GT - GTRider1998 Installation Time: Less than 1 Hour

            Roush axle back

            Couldn’t be any happier with the sound, super easy to install

            Helpful (0)
          • July 28, 2019

            5 2019 GT - Reece Installation Time: Afternoon

            Roush delivers

            I ordered this thinking i would not need the catback and I was definitely right. The first time i started it i said wow. Coming from an eco this thing blew my mind. Roush has me in love with the new noise my car is making

            Helpful (2)
          • July 27, 2019

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

            Roush Axle-Back

            This axle- back has to be the best sounding exhaust for the s550 in my opinion.Definitely a head turner. Is not to loud in the lower rpm range but as soon as you get the rpms up you really hear it growl. I also paired this system with the sr X pipe. That really woke it up even more. If you like your car loud this is a great buy. One of the best features is there is hardly any drone at highway speeds.

            Helpful (2)
          • July 13, 2019

            5 2018 GT - LeeO Installation Time: Afternoon

            Excellent Exhaust - No Drone!

            Easy to install. Jack, jack stands and saw. 2 -4 Hours. Complete. IMO best sounding exhaust without being over the top.

            Helpful (0)
          • June 03, 2019

            4 2019 GT - PeterF

            awesome sound

            the Roush Axle-Back sounds like a beast!!! what a difference compared to the stock. really happy with the decision! only thing that bugged me is the large gap between the tips and the rear valence. would look so much better if the gap was less (in my opinion).

            Helpful (2)
          • May 14, 2019

            5 2019 GT - nik8771 Installation Time: Afternoon

            sounds awesome

            Wife's reaction priceless when cold starting at 6 a.m.! In all seriousness though, it sounds great, and it isn't too noisy when driving at steady speeds. It installed easy. I had the same exhaust for my 2017, and I was happy enough to stick with the same brand.

            Helpful (1)
          • May 10, 2019

            5 2018 GT - AndrewH Installation Time: Less than 1 Hour

            Good but sit low

            Overall good quality and volume. Have a Flowmaster Scavenger X-pipe and now with Roush axle back get that good growl to it. Definitely a head turner but only issue i have is the hanger on the mufflers are to long so the tips sit low. A good exhaust shop can refit a new hanger to fix this but going to cost extra.

            Helpful (1)
          • May 09, 2019

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

            Great Sound

            Very happy with the sound of the Roush Axle-Back Exhaust

            Helpful (0)
          • May 05, 2019

            5 2018 GT - SiuH Installation Time: Less than 1 Hour

            Easy Install!!!

            I swear me and my buddy took about 15 min to install them. Sounds very AGGRESSIVE

            Helpful (1)

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