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Roush Axle-Back Exhaust (11-14 GT; 11-12 GT500)

Item 69059
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      Review & Installation Video

      Hey everyone I’m Justin with and I’m checking out this Roush axle-back exhaust system for all 2011 and up GT Mustangs. This unique axle-back design from Roush features an open chambered muffler, which allows for a more aggressive exhaust note, while keeping drone to a minimum. The system is constructed from 100% stainless steel and features two chambered mufflers and two four inch stainless steel polished tips, both inscribed with the Roush logo. Simple bolt on installation should take you no more than an hour. Let’s hear how this axle-back compares to the stock exhaust.

      Product Information

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


      • Aggressive Exhaust Sound
      • Unique Open-Chambered Muffler Design
      • 409 Stainless Steel Tubing
      • 304 Stainless Steel Tips w/ Chrome Flashing
      • Fits 2011-2014 GT & 11-12 GT500 Mustangs


      Aggressive Muscle Car Sound. Let your engine howl with a Roush Axle-Back Exhaust. This innovative new Roush exhaust system features a hollow 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. Constructed from 409 stainless steel for a durable long life, the Roush axle-back exhaust system features two unique chambered mufflers with 304 stainless steel 4" tips. The 4" tips are finished with a new chrome flashing process that is resistant to discoloration due to exhaust heat.

      Application. This Roush Performance Axle-Back exhaust system will fit the 2011-2014 GT & 2011-2012 GT500 Mustangs with either the factory GT rear valance or the Roush rear valance.

      Fitment: 2011 2012 2013 2014 Details

      MPN# 421127

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 100+ customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • January 09, 2020

        1 2014 GT - Freddyg Installation Time: Less than 1 Hour

        Super disappointed

        Spent $500 for these expecting super loud 4-5 wrenches like the video said but it sounds so quiet. I had pypes Black tips before this and they were half the price for waaaaayyy louder effect. Don’t buy

        Helpful (0)
      • January 03, 2020

        5 2014 GT - CBxJ Installation Time: Afternoon

        Great sound

        Great sounding axel back.. Fairly easy install. 5 out of 5

        Helpful (0)
      • December 21, 2019

        5 2013 GT - Ryan Installation Time: Afternoon

        2013 GT

        First I’ll say I have done some mods on cars, but no mechanic by any means. This exhaust was very easy to install with just a simple floor jack. The stock exhaust took some patients to get off. Word of advise just take the brackets off. That being said was surprised how loud they are being Roush. Outlaw flows would be way to loud for me! Love the sound of these mufflers, and very happy with the finish!

        Helpful (0)
      • December 20, 2019

        5 2012 GT - Andy Installation Time: Afternoon

        One Word: AGRESSIVE

        Even the wife noticed the difference and she was giving me a bunch of flack for getting rid of my Ford Performance GT500 mufflers. SUPER agressive tone, REALLY MEAN exhaust note, this thing is LOUDDDDDD. If you want LOUD and MEAN this is the exhaust to have. Chrome tips look sick too. I'm a fan of seeing the exhaust can from behind but even though you cant see these cans as much, who really cares when the rear diffuser blocks the view anyway. I will tell you though, you might as well plan to buy an offroad X pipe cause this makes the tone of the engine at WOT sound a little old school in my opinion and we all LOVE the coyote 5.0 sound when its really snappy and piercing if you will, dont know how else to describe it. Worth every penny

        Helpful (0)
      • December 17, 2019

        5 2011 GT - Stanley Installation Time: Less than 1 Hour

        Loud like it should be

        The product is amazing. Have drove them from 2 years now. I have the off road xpipe with the Roush axle back.. best combo ever car sound like a racing car. With the boss intake its sound like a nascar. Lol no joke this setup is loud. I was thinking to go with LT headers bit will be too loind for the neighbord. Installation is easy and great product

        Helpful (0)
      • December 17, 2019

        5 2012 GT - Frankyfrank42

        Good but loud!

        Installed these on my GT, which has long tube headers and a erm “free flowing” x pipe. Great sound, but it is loud and can be a bit much at times. It’s quiet enough when just cruising in 5th or 6th gear, but once you downshift or give it a decent amount of gas, these things sing! Cold starts are also VERY loud. My neighbor said it sometimes makes the door on his house shake from about 50 feet away when I start it in the morning. Overall great sound, great quality, great fit and zero droning, but can be very loud so just know what you’re getting into.

        Helpful (2)
      • November 29, 2019

        5 2013 GT - Anonymous Installation Time: Shop Install Installation Cost: 0-$100

        Love these mufflers

        They look sharp and sound great. Sounds like a Mustang should. Not obnoxious but strong. Have someone who knows what they are doing and has the equipment to get the job done. I reccomend these to any Mustang owner. Well worth the price.

        Helpful (0)
      • November 20, 2019

        5 2014 GT - zjthamilton Installation Time: Less than 1 Hour

        Roush Exhaust

        Phenomenal sound! They’re not too loud while cruising around but as soon as you get on the throttle they sound amazing! My favorite part is the crackling when you downshift.

        Helpful (0)
      • October 13, 2019

        5 2012 GT - Jake2400 Installation Time: Afternoon

        Great item

        Was really suprised by the overall sound of this product. Install was simple and straight foward.

        Helpful (0)
      • October 13, 2019

        5 2014 GT - RubyGT14 Installation Time: Less than 1 Hour

        Waking Up Ruby

        I just purchased my 14 GT a few months ago and take her to the track occasionally for street legal racing. Got tired of hearing, “that’s the quietest Mustang I’ve ever heard”. Well, I don’t need to worry about that anymore because “Ruby” has risen and woke up with the install of my Roush Axle Back Exhaust. She sounds incredible and the cabin noise isn’t that bad at all, which makes my wife very happy! Install wasn’t that bad at all, used air wrenches and nothing was seized. Total labor was about an hour. Highly recommend and well worth the money! I do agree with one other comment I read, why aren’t 1 or 2 Roush stickers included in the box??? Most aftermarket items come with these.

        Helpful (2)

      Questions & Answers (58 answers)

      5 Top Rated Questions

      What exhaust to buy? I'm looking for an axle-back exhaust that is one notch above stock in terms of sound. I don't mind WOT loud, but at normal acceleration, idle, and cruise I want just a little more growl. I still want to listen to music and carry on a conversation typically. What exhaust do you think fits the bill the best?

      • This would be the best exhaust for your needs. I installed it on my vehicle and the sound is perfect! It is not loud and obnoxious when you are just driving normal, but when you get on it you can certainly tell a difference. This is the best bang for your buck, and has the best sound!

      Helpful (42) Show 4 more answers

      Will the Roush Axle Back tips be flush I've noticed on the '13 models alot of the aftermarket axle back tips stick out vs being flush with the plastic. Is the Roush flush?

      • You can adjust your tips however you like. Flush, outside the valance or in. I have mine sticking out a bit so you can read the Roush name on them.

      Helpful (15) Show 2 more answers

      Is there only one model of Roush axle backs for the 11-14 gt. Other then the two Square tip ones? I've listened to a lot of YouTube videos and love the sound. Just wanna make sure these are the same Roush mufflers I'm hearing

      • There are a few versions of the Roush Axle-Back Exhaust depending on your exact year model and your year valence. Please use the "filter" option on the left side of the webpage for your year model to show all of the available options.

      Helpful (5)

      Is it necessary to purchase the valance with this roush exhaust I am interested in roush exhaust; however, I prefer without valance. Is that possible?

      • Absolutely! You would just Add to Cart without making the selection under accessory options for the Rear Valance. This would only add the Roush Exhaust to your shopping cart. You could also give us a call if you'd like us to place the order for you!

      Helpful (4) Show 4 more answers

      I have a 2013-2014 GT500 rear valence and quad exhaust on my 2013 Mustang GT..You think its possible to install aftermarket quad exhaust tips on this Roush Axle-Back Exhaust instead of the just the single tips?

      • You would be able to install an aftermarket tip on the Roush Axle-Back Exhaust, however we are unsure if a quad tip would clear your rear valance with this axle-back.

      Helpful (3)
      10 More Questions
      How much louder will this exhaust be with bbk shorty headers installed while the rest of the exhaust is stock? 1 answer
      Is This roush axle back smog legal in the state of California? 1 answer
      I already have a after market exhaust on my car and I’m looking to increase the sound even more so is this model the right one if I’m looking for the loudest sound I can get or do you have any other models on you’re website that would work for me? 1 answer
      I had the Roush catback for the 05-09 GT is this a pretty similar sound? Or would I need to get a H-Pipe or X-Pipe? 1 answer
      Is this system offered with black tips? 1 answer
      I put a CAI with a BAMA tune on my 2014 GT last year from American Muscle. If I put the Roush Axle-Back Exhaust on, will it effect my tune? 1 answer
      will this system work with my 2014 gt/cs. 1 answer
      Will these fit on the BBK Off-road X pipes? for a 2014 GT? 1 answer
      sound is this exhaust so loud that you can't hear the radio or talk to someone? 4 answers
      How loud will these be with 1 7/8 long tube headers and catted X pipes? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Muffler assemblies
      • (2) Tips
      • (4) Clamps

      Tech Specs

      Axle-Back Exhaust Specifications
      Piping Material: 409 Stainless Steel Tip Material : 304 Stainless Steel with Chrome Flashing
      Piping Size: 2.75" Tip Size: 4"
      Muffler Type: Chambered Fitment: 2011-2014 GT & GT500 Mustangs

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • GT - 11, 12, 13, 14
      • GT500 - 11, 12

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