Roush Axle Back Exhaust Stainless Steel GT 2011-2014

Roush: 421127
MSRP: $489.99
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Product Description

Roush Stainless Steel Axle Back Exhaust for 2011-2014 Mustang GTs.

This new axle back exhaust from Roush offers your brand new 5.0-liter Mustang a distinct and aggressive sound. This highly tuned system avoids the annoying in-cockpit boom, which can occur with competitive systems.

Constructed from 409 stainless steel, this axle back exhaust system features an exclusive open-chambered design that will not deteriorate over time, unlike conventional fiberglass roving material. Exhaust tips are made from 304 stainless steel and finished with a unique chrome flashing process.Chrome-flashing on tips provides heat resistance to color change.

Installation is quick, easy, and uses all factory hanger locations and pierce points. No modifications to the vehicle are necessary. All the hangers are chromed for superior appearance and corrosion resistance. New, high quality OE-spherical clamps are included in the kit.

-No negative impact on emission devices
-Hollow chamber yields higher airflow
-Fits both Ford factory and Roush rear valance

Similar Mustang Parts

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Installation Instructions


Difficulty: Moderate

Mustang Applications

This product will fit the following Ford Mustang years:

Product Reviews

Write a Review
Roush Axle Back
Best 'Bang for your Buck'. The videos don't serve this exhaust any justice, must hear it in person. Easy install, excellent fit/finish and sounds amazing. Tame while cruising but roars to life under load. I haven't listened to the radio since the install. The gargling/crackling on downshifts and pops between shifts is all I need to hear. Very impressed with the extremely fast shipping from CJponyparts, also had the lowest price with free shipping too.
Schneider March 9, 2012
Nice exhaust
I got this for my 2012 Shelby 100% stock except hi-flo filter and intake resonator delete. The sound is a low rumble at idle and at low speed driving. They are quiet with zero drone at highway speeds, The only drawback to me is under heavy acceleration they are kinda raspy. The stock mufflers sounded smooth throughout the rpm range. I've heard this can get better with time. Oh well, they are much lighter than stock mufflers and are loud but not obnoxious 'to me anyway', I'll learn to adjust..I you want a deep tone exhaust that screams when you open it up with quiet cruising and zero drone and can live with raspiness this system is for you..
H. Sharot December 31, 2011
Great Price, Even Better Product
Found my Roush Exhaust on CJPP for cheaper than anywhere else on a one day sale. I picked them up after reviewing several different brands, including Borla, Flowmaster, and MAC. Each boasted the same stats more or less, the main differences I saw were weight and price. Once received, these puppies were installed and ready to roll within 45 minutes between a friend and I (no, hadn't installed them before, just pretty straightforward with the instructions included) and haven't regretted it since! Definitely gives your ride that American Muscle sound you wish it had from the factory!
Kevin November 2, 2011
Excellent Product!
Roush products are first rate. All the reviews are 5 star for good reason. Installation of the axle back exhaust kit took about an hour and the fit is perfect on our 2012 GT/CS. The exhaust sound is fantastic! Wow! They're quiet at highway speeds but emit a real nice growl when you 'get on it'. We own an 08 Roush Speedster and formerly owned a 69 Mustang GT Convertible and an 07 GT/CS. We had Flowmaster and Magnaflow exhaust on those vehicles and this Roush system is truly the best sounding of all! I highly recommend it.
Phil Eagon October 18, 2011
Highly Recommended for every 5.0
I highly recommend this exhaust system. 1. It is a perfect fit that is easy to install. The hardest part of the install is pulling the stock exhaust off the hangers. Once you get the stock exhaust off, it took 15 minutes total to put the Roush exhaust on. 2. Roush does Mustangs. They are a reputable company and so I felt comfortable putting them on my mustang. 3. Last but not least, they sound absolutely amazing. WHen you get into the throttle, everyone within a mile will know. I know this because my buddies heard me coming into their neighborhood. BUT when you are cruising, there is very little cabin noise. You have the best of both worlds. It is nice not having the annoying hum inside the car everywhere you go. And not to mention, when you can get these things 10% off at CJPonyparts, they are well worth the price. I am constantly turning heads and getting compliments on how the car sounds. Pair with the Roush cold air intake when they have the 10% off specials and you'll pick up both
Daren June 12, 2011
Sounds like a muscle car should!
After listening to sounds clips for months it came down to Roush and Borla. I decided to go with Roush from CJ Pony Parts. The service from CJPP was great. The sound from the Roushs are unbelievable. Everyone comments how great my 5.0 sounds. The sound is addicting! When cruising there is no drone and the sound from the mufflers are bearly noticable. Step on it though and it is a different story. This is the first mod to my 5.0 and I could not be happier.
John M June 10, 2011
I am very glad i went with the roush awesome sound, no drone at highway speed at all, littlle at highway speed ,but at WOT it talks to yah
April 11, 2011
Fast Shipping/Great Price
I called there 1800 phone number on a Friday. That Wednesday the Roush exhaust system was at my door, very quick shipping (and I'm in TX). I installed them the next day (with a lift) in about 1.2 hours. It comes with new clamps for exhaust, so don't worry about taking off the clamp from the OEM exhaust, which is welded on. All three hangers lined right up correctly and fit is perfect. The sound has no drone like other brands and turns heads when you give it the gas. I've had three other mustangs (all with Flowmaster) and the sound that comes out of the new Roush Exhaust will put a smile on your face!
Chris April 2, 2011
Service, Price, Free Shipping, Congenial Sales Staff, and the best Mufflers
My initial call was with a salesperson named Tom. He was very efficient and friendly. He had most of the info needed for purchasing what I wanted. I went ahead and ordered my new Roush axle-backs. He told me they may take a while to get here, maybe 7-10 days, which was fine. I received them, happily in 6 days and installed them 2 days later in my driveway. Just happen to have an unusual 50 degree day here in MA. Anyway, everything went just great and I would definitely recommend CJPony Parts, to anyone buying anything for you Mustangs. Oh, by the way the mufflers went on without a hitch. They sound great and just from the weight reduction we should get better mileage and lower et's!!! The original mufflers have to weigh at least 70 pounds together. I put them together in a box and could barely lift them( I'm almost 65 yrs old). Still having fun!!!! Paul D. Snowbank, Mass. the measurements of the pipe is 2 1/2 inch and the tips are 4 inch, Beautiful.
Paul D. March 5, 2011
These Roush mufflers are the best!!! I have a 2011 GT Premium white coupe with charcoal leather and the parchment stripes, 3.73, HID, Polished aluminum 18's, and some other low key stuff. Anyway, I've been watching muffler videos and driving my wife nuts for about 6 months. I finally narrowed it down to Roush or Hushpower Flowmasters. I wanted something a little aggressive. I've been interested in a particular clip with a grey GTCS covertible with a black convert roof. The Roush sound a little raspy on the video, but they are not at all bad. The comparison left me with the question, why is it everytime the sound clip for the Hushpower comes the guy has to really get into the throttle to make these things heard? When I got the Roush mufflers installed, I didn't even get out of my driveway and the neighbors were coming over to listen to my new 'Songbird'!!! Sweet!!!! They are mellow but when you do get into the throttle you can tell, this thing means business. Have Fun, mouser!(These are a 10) Highly recomme
mouser March 5, 2011
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Product Video

By Bill Tumas: For many Mustang owners a high-performance exhaust system is the first modification on the list. Besides the obvious performance gains, for many it's about getting that Mustang sound just right. What constitutes "just right" can be very subjective. Many of our customers agree, if you have a 2011-2014 Mustang the Roush Cat-Back is one of the best sounding systems out there. Today we are going to install this system on this 2011 Mustang GT.

The Roush system is completely made out of 409 stainless steel, includes these chrome rolled tips, and comes in an attractive price as well. All the hardware necessary for installation is included. The system is going to give you a nice, aggressive tone and a wide-open and throttle, yet have a nice non-droning sound for normal driving. For this installation you need jack and jack stands or lift, a 3/8 ratchet of impact gun, half-inch deep socket, 15-millimeter deep socket, flat-blade screwdriver, pry bar and safety glasses.

Once you get the back end of your car off the ground, the first step is to remove the factory mufflers. We're going to start by disconnecting the clamps located right here. All this can be done with hand tools, but we're going to use our cordless impact. We're going to remove the passenger side. At this point there is two ways you can get the mufflers off. You can remove the hanger bolts themselves and pull the whole assembly out, or you can unbolt these intermediate pipes, separate the two and then pull the muffler off. We're going to pull the intermediate pipes. Now we are going to separate the intermediate pipe. Now we are going to slide the muffler off the rear hanger. We're going to slide it back off the rear mounts. Now remove the other side in the exact same way.

Now we will install our new mufflers. Make sure you install them with the pipe going towards the inside of the car, hangers going towards the back. Now we will install on the rear hanger. Now we are ready to rehang the intermediate pipe. Let's start by putting the supplied clamp up into place. Now we'll put the intermediate pipe back on. It's a lot easier to put the clamp onto the intermediate and slide it up into place. Now we will line the intermediate up with our new Roush exhaust, clamp over, and tighten it down.

Now we will move on to the passenger side. Now I'll retighten the clamps from the intermediate to the H-pipe. We'll install the clamp onto the tip first, put the tip onto the muffler, and line it up, and then tighten it down. Now we'll install the passenger side in the same way. Line it up and then tighten it down. If you're finding your tip is too close to your valves like ours is here, then loosen the clamp that connects the muffler to the intermediate pipe and twist it outward for more clearance. Our installation is finished.

Our new exhaust looks great. We know most of you aren't buying it for looks, you're buying it for sound. Let's get it outside and see how it sounds. The Roush exhaust gave us a nice aggressive tone, still tame enough for daily driving. Installation should take you no more than an hour; you'll be back on the road in no time.