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

Market Price $549.99 You Save 6% ($35.00)
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  • Item 69059
  • MPN# 421127

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Features, Video & Details

  • 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

Review & Installation Video

Review & Install 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.

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

What's in the Box
  • (2) Muffler assemblies
  • (2) Tips
  • (4) Clamps
Installation Info
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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Most Helpful Reviews

Great Raspy Sound

This is a great fitting, high quality product with an awesome exhaust note. I originally added to my bone stock car, sounded great, loud under acceleration but hardly noticeable inside at cruising speeds. ...

Read More
Helpful (1)

Now it's a Muscle Car

I purchased a 2011 Mustang GT Prem. This was my 1st muscle car, which I was quite disappointed in the kitten sounding exhaust. I researched for about a month listening to probably over 50 or so video ...

Read More
Helpful (3)

Overall Rating 4.9 out of 5 stars
Read All 100+ Reviews

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32 Questions / 15 Answers

Ask a Question

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?


Helpful (36)
  • 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!


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?


Helpful (9)
  • 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.


Show 2 more answers

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?


Helpful (2)
  • 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!


Show 4 more answers

Will these fit on the BBK Off-road X pipes? for a 2014 GT?


Helpful (1)
  • The Roush Axle-Back Exhaust (11-14 GT, 11-12 GT500) will work with the BBK off-road x-pipes.


How would this set up sound with no cats? Decently loud/good tone or obnoxious? I have a GT500 with magnaflow competition catback. Would roush be loud but a different tone with no cats?


Helpful (0)
  • The Roush Axle-Back Exhaust would be loud with no cats, however it would not be as loud as magnaflow competition exhaust with no cats. The tone would differ, with the Magnaflow offering a more aggressive tone.

    Rob D

what is the size of the shipping boxes of this exhaust system? i need to know if I can grab those boxes with me in airplane


Helpful (0)

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Customer Reviews (100+) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume 4.745033 4.7
  • Exhaust Note 4.87728 4.9
  • Fit & Finish 4.892206 4.9
  • Bang For Your Buck 4.810631 4.8

  • 5/5

    Installation Time: Afternoon

    January 01, 2017

    Great Raspy Sound

    This is a great fitting, high quality product with an awesome exhaust note. I originally added to my bone stock car, sounded great, loud under acceleration but hardly noticeable inside at cruising speeds. I then removed the resonators and it really opened it up, much more raspy and even louder under acceleration. Then I replaced the factory H-pipe with a Pypes after Cat X-pipe and it really smoothed the exhaust note out and quieted it down some. Only complaint with sound is, with the H-pipe I am not the biggest fan of how it sounds idling (still not all that noticeable though). I did not notice any drone with any of the exhaust combinations that I have done with the Roush ab's. Great product!


    Year: 2014 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    December 12, 2016

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

    Man these pipes will wake up your stock 5.0 car and have you sounding like a Nascar ate a bowl of rice crispy with all Tha snap ,crackle and pop. I love it


    Year: 2013 Submodel: GT

    Helpful (1)

  • 4/5

    August 23, 2016


    Work the buck, nice tone with my boss 302 H pipe with side exhaust, cant wait for my full raush headers with x pipe ..


    Year: 2013 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    July 06, 2013

    Excellent product

    One of the axle-backs was scratched and dented, but I contacted and I received a replacement very quickly. Great exhaust note; loud with cold-start, mellow with light driving, but will scream when RPMs increase! I do have a concern about the rusting issue I've been reading about after my purchase... I suppose only time will tell if that issue occurs..


    Year: 2013 Submodel: GT Indiana, USA

    Helpful (1)

  • 5/5

    August 15, 2011

    Now it's a Muscle Car

    I purchased a 2011 Mustang GT Prem. This was my 1st muscle car, which I was quite disappointed in the kitten sounding exhaust. I researched for about a month listening to probably over 50 or so video clips of various exhaust. I finally decided on the Roush axle back which I am glad I did. She sounds like a lion now no more of that little kitty purring.


    Year: 2011 Submodel: GT

    Helpful (3)

  • 5/5

    June 28, 2011

    Roush Axle Back Exhaust

    The Roush exhaust pipes were a breeze to put on. One wrench and about 30 minutes you are in business. The alignment is almost automatic, so one person can easily do the job. The sound is great, but it did take a couple of days to get used to the change. It sounds more like a car with 400+ horsepower than it did with the factory pipes. I made the exhaust change the same time I put on a new Airaid cold air system. I am certain that increase of air on the front end had some effect on the sound in the rear. Great combination....

    William Shaffer

    Year: 2011 Submodel: GT

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    September 21, 2011

    50 year old man here, smiling like a teen again!

    After reading all of the reviews here, I have no regrets with this purchase. They sound awesome! When cruising at 70 or so in my 2012 GT Premium you can barely hear them, but open the throttle and the holy sh*! factor kicks in. You will not be disappointed. This Mustang sounds like it should. I revved the engine in a parking garage for my coworker to hear, and we were giggling like a couple kids that just blew up a stick of dynamite. They are loud but did not set off car alarms nearby.


    Year: 2012 Submodel: GT

    Helpful (26)

  • 5/5

    November 29, 2010

    Oh yeah...!

    These were a delightful surprise. In this world, it seems increasingly true that you get what you pay for, and this often a lt for a little. I listened to every audio file of every exhaust out there, and liked the Roush the best. The Roush preserves the classic Ford small-block rumble, yet when the cams come on at about 4,000 RPM, it sounds absolutely ferocious. Nothing tops the sound of a throughbred V-8 when its angry, and for me that means the Roush axleback. Highly recommended


    Helpful (30)

  • 5/5

    Installation Time: Afternoon

    October 31, 2011


    This Axle-back exhaust sounds absoutly fantastic. They were not complex to install at all. Once the car was up on ramps, I was able to crawl under with plenty of clearance to remove the stock exhaust and install these. Since this was the first mechanical upgrade I have installed myself, I took my time. It took me 2 hours total, to remove the stock exhaust and install the Roush Axle-Back exhaust. Idle: no louder than stock (outside or in cabin) Normal Acceleration: louder than stock but not obnoxiously loud. Quite amazing actualy WOT: A roar that brings a smile to my face! If you are looking for an axle-back system that increases air flow, upgrades the overall sound, looks fantastic, and is easy to install on your own, look no further!


    Year: 2011 Submodel: GT Virginia

    Helpful (11)

  • 5/5

    July 29, 2011

    Great sound, easy install, high quality

    I've had these on my car for almost 4,000 miles now and can honestly say they get even better with time. When I first put them on there was a little popping here and there and tone was a little high pitched but after awhile the popping is minimal and they have a much deeper tone. As far as quality well IMO they look just as good as the day I installed them. Speaking of install....that was a snap easily done in under an hour with a set of ramps in driveway. Sounds awesome especially at high rpm's with little to no drone at 75 mph.

    Jeremy C

    Year: 2011 Submodel: GT

    Helpful (11)

  • 5/5

    Installation Time: Less than 1 Hour

    May 25, 2012

    A Guaranteed Smile Maker

    As a recently retired 62 year old geezer, I decided to put the Roush exhaust on my 2011 GT500. Install was a breeze and then it was the time to fire the baby up. When I first heard the notes of this exhaust, a smile appeared on my face and extended from ear to ear. And then I drove the car with my windows down and listened to the Roush Symphony Orchestra. The notes can be civilized and subdued, but also aggressive and throaty when called upon. The sound is not an ear piercing rasp, but rather a nice rumble of power. Excellent!


    Year: 2011 Submodel: GT500 Smyrna, New York

    Helpful (9)

  • 5/5

    Installation Time: Less than 1 Hour

    March 19, 2012

    Worth Every Penny

    One of the first things I wanted to do for my new 2012 Mustang was to upgrade the exhaust. I spent countless hours watching video after video of all the exhausts available. From all the research, I decided that I wanted the Flowmaster hushpower or the american thunder for the cheaper price. I then read more about aftermarket parts and new mustangs and discovered that buying these parts could void my warranty. I called multiple ford dealerships to see what they said. They recommended I buy a ford racing exhaust. I considered the GT500 exhaust, but from the clips I listened to, the sound was not much louder but only deeper. The other Ford Racing axle backs were also too expensive. I then asked about the Roush, which was slightly more expensive then what I had been looking at with the GT500 and Flowmaster, and Ford said Roush and Borla products shouldn't effect the warranty like other brands could. I thought it sounded good on youtube and american muscle so I purchased the axle backs. It shipped on time with no damage. I then had it professionally installed so the dealership could not give me grief for doing it myself. I read reviews saying videos and sound clips do not do this product justice and everyone is right! From a cold start, it has a deep rumble without being obnoxious and too loud and after warming up it sounds like the stock. However step on the gas and it roars to life! This is what a mustang should sound like. It is much louder and aggressive like a muscle car should sound. At first I was worried that they would not be as loud as I was looking for but I definitely was not disappointed. My Mustang turns heads everywhere I go now. If you are trying to decide on an exhaust but you can't make up your mind, just go with the Roush axle backs. It is a high quality part that definitely is worth the money. I promise you won't be disappointed.


    Year: 2012 Submodel: GT San Antonio, TX

    Helpful (9)

  • 3/5

    Installation Time: Afternoon

    June 23, 2012

    Awesome sound, but quality lacking

    Have had this exhaust installed on my mustang for a year now. The sound is incredible, best i've heard on an aftermarket exhaust. Sort of subdued at idle, but with a bit of the lumpy, motorboat sound coming through. Through 3000 rpm, nice, throaty sound. At around 3000, car screams like a banshee, without being too raspy. Got this system to replace the pypebombs - they had a terrible boom at highway speeds. These don't. That said, I'm not at all impressed with the quality. After 13 months of garage storage and 11000 miles of use (never on salty roads) the sound at light throttle changed, picking up a rapid metallic tapping. Put the car on the lift today to find out that both mufflers are falling apart. The cylindrical portion of the muffler is separating from the front end cap, at the weld. Both mufflers have soot deposits at the cracks, indicating exhaust leakage through them. Additionally, the mufflers and associated piping both have more rust than my 4 year old catback system on my daily driver/winter beater. Will update review once I hear back from Roush on their 3 year warranty and if this is covered - I have a feeling that I won't be the only one that has to use it.


    Year: 2011 Submodel: GT baltimore, md

    Helpful (7)

    • Response from AmericanMuscle

      This is definitely the first time I've heard about any quality issues with this axle-back. I'm sorry to hear about your experience, but I'm confident that Roush should be able to assist you without any problem! But if for any reason they can't help you out, please give us a call; we'd be glad to remedy the situation!

      Lisa , Customer Care

  • 5/5

    Installation Time: Less than 1 Hour

    April 09, 2012

    Sound of the Beast

    Outstanding exhaust note. Sounds like how a V8 should, rumble not raspy. No drone present even at Autobahn speeds. Make no mistake though, these Axel-backs are loud, especially when you turn the engine over on a cold morning. Was considering SLP's as well but figured for daily driving it might be a tad bit too much. Install was a breeze. As for removing the stock driver's side muffler, just got ahead and unbolt the muffler from the hanger first, then remove the whole unit. Don't waste time trying to pry off the flange. You will notice a considerable weight difference with these, much lighter than stock. Couldn't be happier.


    Year: 2012 Submodel: GT Germany

    Helpful (7)

  • 5/5

    Installation Time: Less than 1 Hour

    September 20, 2011

    Excellent choice

    i did a lot of research before selecting an axleback. I was looking for something with a deep aggressive tone that would scream when opened up. I also wanted something that wouldn't drone or be loud at highway speeds. The roush system delivered for me. It was also a big weight savor over the stock exhaust. Install was sympol. It only took 27 minutes for everything. Shipping was quick and American muscle had the best price on the roush system, I only paid 342 during one of there sales.


    Year: 2012 Submodel: GT Raeford nc

    Helpful (7)

  • 5/5

    Installation Time: Afternoon

    September 11, 2011

    Great sound!

    After adding these axlebacks to my car I couldn't believe the incredible tones they produced: cold start sounds great, down shifting gurgling, and when you call on it, wow. I would disagree with those who say these are to loud for a conservative neighborhood. For one, the exhaust is minimal at idle. Secondly, at low RPMS not loud at all. Yes, when you cold start you might get some notice, but that's about it. Drive in a higher gear with low RPM, and you won't cause a stir. Maybe some people are driving too fast in the neighborhood =D Finally I would say that people over simplify the installation. The directions that come with the kit are ok, but the pictures are completely unreadable. Regardless, the directions leave out a step required for removing the exhaust on the drivers side. Still all in all only took me a couple of hours with jack stands.


    Year: 2011 Submodel: GT North Carolina

    Helpful (6)

  • 5/5

    Installation Time: Shop Install

    September 10, 2011

    Amazing Axle Back exhaust System

    Installed the Roush axle back exhaust system on my 2012 Ford mustang 5.0L and I was blown away. The sound was incredible. When I started the Mustang when the motor was cold it was really loud, not a bad loud but enough to make me think oh gosh what did I do beacuse I wanted a nice sounding exhaus and not a system that was to overwhelming. Although once the Mustang warms up the tone is beautiful. No drone whats so ever, pleasant to cruise with and when you stomp on that gas people will turn. GET THIS AXLE BACK you will not be disapointedn =D


    Year: 2012 Submodel: GT Toronto

    Helpful (7)

  • 5/5

    November 23, 2010

    Roush Axle-back Exhaust

    Listened to several axle-back systems,liked these the best.Now that I have them on the car I'm glad I selected the Roush...great sound,fit and finish. Easy to install,also compare price against all other makes.

    Ray Jones

    Helpful (16)

  • 5/5

    Installation Time: Afternoon

    May 24, 2012

    Roush Axle back Exhaust

    I received this Roush axle back exhaust system in a timely manner from American muscle. They were very well packaged and emerged from the wrappings complete, and in flawless condition. I was unable to follow the install instructions for my 2012 GT because I didn't have a lift. This posed no problem though, they were easy to install by lying on the ground under the back valance of the vehicle without using a jack. If you install this way, you will need to spray lube (WD40) the bolts and all rubber mountings where the muffler rails slide through the rubber hangers. You will also need to loosen the forward hanger bolts L and R side and remove the aft hanger bolts L and R side. After doing this, loosen and spread the exhaust couplers R and L side. The factory mufflers will now be easier to remove by pushing up at the Hpipe exhaust joint, and pulling the mufflers down and forward, while sliding the hanger rails out of the forward rubber hangers. Just reverse this process for the install of the Roush mufflers, they are smaller and much lighter than the factory axle backs, and install much easier than the removal of the factory mufflers. After I had installed the Roush's, the 1st start up was amazing, WHAT A BEAUTIFUL SOUND! They really roar under acceleration, and are much louder outside the car than inside, they are almost unheard inside the car at freeway speeds. No drone inside the car at highway speeds but touch that throttle and WOW! You're in a Daytona 500 car, ACOUSTIC PERFECTION! Although these are 50 state legal, I would advise that you don't get on it when a police cruiser is nearby, no sense in having to prove they're legal. Don't waste your money on anything else, these Roush axle backs are highly polished, top shelf stuff. If you liked the sound of that Mustang in the Steve M'Queen movie, Bullitt, then you are really going to like your GT on Roush sound steroids. Thank you Roush, and American Muscle, a truly amazing product.


    Year: 2012 Submodel: GT Maple Valley Heights, Renton, WA 98058, USA

    Helpful (5)

  • 5/5

    Installation Time: Less than 1 Hour

    April 10, 2012

    All I can say is WOW !!!

    Just had these put these on three weeks ago on my 2011 GT500 Coupe. My Shelby now sounds like an official muscle car !!..Nasty and noisy. Do my best in the neighborhood, to keep the sound, not easy !..Once on the highway, LOUD and drone once in 5th/6th....HIGHLY RECCOMMEND


    Year: 2011 Submodel: GT500 Cumming Ga

    Helpful (5)

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