Roush Axle Back Exhaust Stainless Steel GT 2011-2014

Roush: 421127
MSRP: $489.99
CJ's Low Price:
1419033600 4668
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CBR10 Play Roush Axle Back Exhaust Stainless Steel GT 2011-2014 Video 1 Play Roush Axle Back Exhaust Stainless Steel GT 2011-2014 Video 3 Play Roush Axle Back Exhaust Stainless Steel GT 2011-2014 Video 3

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

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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
roush exhaust
awesome mufflers cant believe they're so cheap, everyone should get them
MikeH February 19, 2011
Best exhaust for the best price
This is by far the best exhaust for the 2011 5.0. Hands down the best sound with no drone and it is one of the cheapest! Dont wait, get these, you will not be disappointed.
Eric Thompson January 6, 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.