Roush Axle-Back Exhaust Kit Stainless Steel GT 2011-2014

Roush: 421127
MSRP: $489.99
CJ's Low Price:
$469.99
1475193600 4668
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Roush Axle-Back Exhaust Kit Stainless Steel GT 2011-2014
Roush Axle-Back Exhaust Kit Stainless Steel GT 2011-2014 Play Roush Axle-Back Exhaust Kit Stainless Steel GT 2011-2014 Video 1 Play Roush Axle-Back Exhaust Kit Stainless Steel GT 2011-2014 Video 2
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Product Description

Roush Stainless Steel Axle Back Exhaust Kit for all 2011, 2012, 2013 and 2014 GT Mustangs.

This amazing axle-back exhaust kit from Roush will offer your 2011-2014 5.0-liter Mustang GT a distinct and aggressive sound. The Roush axle-back system is a highly tuned piece of engineering that will avoid the annoying in-cockpit boom, which can occur with other competitive exhaust systems on the market.

Installation is quick, easy, and will use all of the factory hanger locations and pierce points. No modifications to the vehicle are necessary. And all of the hangers are chromed for superior appearance and corrosion resistance. As an added bonus, brand new, high quality OE-spherical clamps are included in the kit to complete the installation without reusing the clamps found on your factory axle-back.

Features and Benefits:
- No Negative Impact on Emission Devices
- Hollow Chamber Yields Higher Airflow
- 4” 304 Stainless Steel Chrome Tips
- Fits Both Ford Factory and Roush Rear Valance
- Higher Air Flow and Less Back Pressure for Increased Horsepower and Torque
- Direct Bolt-In, For an Easy Installation
- Includes All Necessary Hardware and Instructions

*Will also fit 2011-2012 GT500 Mustangs with the stock or Roush rear valance.

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. The 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.

Order the Roush Stainless Steel Axle Back Exhaust Kit for your 2011, 2012, 2013 or 2014 Mustang GT from CJ Pony Parts today!

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Mustang Applications

This product will fit the following Ford Mustang years:

Product Reviews

Write a review
Roush Axle-Back Exhaust Kit Stainless Steel GT 2011-2014 is rated 5.0 out of 5 by 20.
Rated 5 out of 5 by from Perfect sound, even better with an X-Pipe! Bought the Roush axleback kit after finding the GT500 axleback kit a bit tame for my liking. Had a shop install the axleback so I can't speak for how easy it was, but they were done in 40 minutes. The volume is perfect and the tone is aggressive. It is louder on the highway compared to the GT500s, but minimal resonance and drone. Later I ended up adding an after-cat X-pipe and it completely changed the sound. Slightly quieter and a much higher pitch from the exhaust. Seemed to also get rid of the minimal highway drone and the "snap crackle pop" sounds when slowing down using the factory H-pipe. Still a little loud on cold startup, but for the price, it's hard to beat the Roush axleback.
Date published: 2015-10-17
Rated 5 out of 5 by from Roush Axle Back Exhaust - Excellent Sound I ordered this to replace the exhaust on my 2013 Mustang GT. I had watched several videos of others that replaced theirs and the sound improvement was awesome. I had the Ford dealer install the exhaust and I couldn't be happier. When I started the car after having it installed I was amazed at how good it sounds. I was equally amazed and happy that at freeway speeds the exhaust is not much louder than stock. CJ Pony Parts shipped the exhaust on the day I ordered it (Friday) and I got it on Monday. Very happy with the product and the fast shipping.
Date published: 2015-08-23
Rated 5 out of 5 by from Great sound!! My wife and I did a lot of research before deciding on the Roush. We listened to several different exhaust systems on you tube through our Bose sound system. I have to say the videos sounded great but did not give the true sound you would get live. We had the Roush installed and my wife picked the car up that day because I was working. When I got home she was waiting for me and I stood behind the car when she started it. I could not believe how great it sounded! She said all the guys at the muffler shop stood outside and watched her leave to hear the sound. It is much louder than I thought when you get on it, but driving down the road sounds quiet enough to have a normal conversation. We could not be more pleased with it!!
Date published: 2016-05-31
Rated 5 out of 5 by from Awesome! Fast shipping only took three days to get them. They look great! Can't wait till this summer to put them on.
Date published: 2015-03-10
Rated 5 out of 5 by from Roush Axle Back I installed the Roush Axle Back a few weeks ago on my 2014 Coyote, and I couldnt be happier with the outcome! The kit is pretty quiet during basic driving. (No pesky drone sound when highway driving either!) Its docile up to about 3500rpm, go above that or at WOT, the car sounds like it should! AWESOME product and I highly recommend to anyone Installation took less than 2 hrs and I didnt even have to remove the intermediate pipes to get them on!
Date published: 2015-02-13
Rated 5 out of 5 by from Roush Axle Back awesome sound Very quick delivery to NZ. Very easy to fit and wow amazing sound over factory exhaust. Increase HP is also very noticeable. Well worth while upgrade and worth every penny. Many thanks CJ's.
Date published: 2015-04-01
Rated 5 out of 5 by from Easy Install, Great Look and Nice Sound Installation took about 90 minutes and the instructions were excellent. The exhausts sound great much better than the stock exhausts. I would highly recommend these.
Date published: 2015-10-04
Rated 5 out of 5 by from Great product upgrade Very fast shipping. Installation was good, it fit together nicely. Wow it sounds great. A good upgrade. People will notice. Performance improved,more responsive.
Date published: 2015-06-27
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Product Questions

Whats dificence between axle back roush for 2011-2014...and roush axle backs for 2015 up

Asked by: Roy598
They are completely different in the way they attach to the mid pipes.
Answered by: rk cjpp
Date published: 2016-09-09

what is shipping cost and duty to canada

Asked by: sifty
Our system will calculate the cost for you, just add the part to your cart and add in your shipping information.
Answered by: Rick CJs
Date published: 2016-05-27

Will this fit my 2014 GT California Special 5.0

Asked by: Bryanb632
Yes it will
Answered by: Rick CJs
Date published: 2016-05-27

Will the Roush axle back exhaust kit fit my v6 basic mustang?

Asked by: Mr_Ed55
This is for GT's only.
Answered by: rk cjpp
Date published: 2016-02-18

Own 2012 GT500 all stock. Are these compatible? Louder,  or different  sound than stock exhaust? Will they fit the stock valance? Lastly, any performance increase?Thank you. 

Asked by: baron95
Yes, they will fit your 2012 GT500 with the stock valance. They are significantly louder then your stock exhaust. You may notice a slight increase in performance, but most of those gains are going to be found further upstream.
Answered by: CJPP Dave
Date published: 2015-12-15

What is your best price on the Roush 421127 Axel back exhaist kit

Asked by: Bohunk
Do you offer incentives on the 421127
Answered by: Fisherman2
Date published: 2015-11-21

How much hp increase could you expect on a 2014 mustang gt?

Asked by: Jon St
It'll give you a modest power increase.
Answered by: CJ Pony Parts
Date published: 2015-10-25

This system improve the potency for my mustang 2015?

Asked by: Julian
No, this kit does not fit on a 2015 Mustang.
Answered by: CJ Pony Parts
Date published: 2015-06-18
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Product Video

Roush Axle-Back Exhaust Kit Stainless Steel GT 2011-2014 Video Transcript
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.