Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $15,000!! Enter Now
Coronavirus: We are Open For Business, Prioritizing health and safety Learn More

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

Item 404877
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $675.99 You Save 4% ($26.00)
Our Price


FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
In Stock

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

      Review & Installation 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

      Product Information

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


      • 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


      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

      MPN# 422097

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (51)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 51 customers

      Installation Time: Afternoon

      Installation Cost: $250-$500

      • April 01, 2020

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

        Roush axle-back exhaust

        It’s sounds really good. Better than what I expected. I’m glad I purchased it!

        Helpful (0)
      • March 02, 2020

        5 2019 GT - Inkd90 Installation Time: Less than 1 Hour

        Roush axle-back

        By far the easiest exhaust to install. Literally Took five min cutting and everything. Exhaust has a deep sound which is what I like. No drone in the car. Def a great exhaust.

        Helpful (0)
      • February 09, 2020

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


        These were very easy to install and the sound is incredible.a must have for any mustang

        Helpful (1)
      • 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 (1)
      • 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)

      Questions & Answers (13 answers)

      5 Top Rated Questions

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

      • The tubing diameter is 2.5".

      Helpful (2)

      Can I just get the roush dual exhaust tip?

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

      Helpful (1)

      Does it come with both exhaust or just one ?

      Will this fit in a Mustang 19 EcoBoost if I also install the Anderson composites rear valance type OE quad tip?? ... Thank you

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

      Post Your Question
      8 More Questions
      Are the tips actually 4 inches because I’ve heard they’re only 3.5? 1 answer
      Will these fit a “19 GT Premium convertible? 1 answer
      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

      Installation & What's in the Box

      Installation Info

      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

          Related Mustang Categories