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Kooks Performance Axle-Back Exhaust (11-14 GT)

Item 65513
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      Review & Installation Video

      Hey. Stephanie with, and I'm going to be taking a closer look at the Kooks Performance axle back for the 2011 to '14 Mustang GT. With over 40 years in the exhaust and header game, Kooks has become known as one of the most trusted names in the industry thanks to their top-notch quality, fitment, and performance. And if you guys would like to see more from Kooks as well as other exhaust options for your ride, you're going to want to make sure that you subscribe to our YouTube channel so you can stay up to date with all of the latest products and product overviews for your ride. While you're there feel free to drop us a comment, question, or compliment. We always like to hear from you guys.All right. So that same great craftsmanship that we've all grown to expect from Kooks headers has found its way over here to the performance axle back. Quality of materials and welds are in full effect, including 100% stainless construction throughout. In addition to the polished 304 grade stainless, 4 inch slash cut tips make for a great look out back. This particular axle back features a combination of two and three-quarter and three inch piping, both of which are manual bent.Now guys, we want to help you find the perfect exhaust for your ride so in addition to listening to these sound clips, I suggest you click the link below to head back to the product page if you aren't there already to read up more about the Kooks axle back in addition to real life customer reviews on the site.Since this axle back is a direct bolt on replacement for the '11-'14 Coyote GTs, getting it installed should be a straightforward process taking no more than an hour from start to finish. If you have any questions regarding the Kooks axle back or any other product for that matter, you can always reach out to a Mustang expert here at and they'd be happy to give you a hand. Now let's hear how the Kooks axle back sounds compared to our factory exhaust.

      Product Information

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


      • Aggressive Muscle Car Exhaust Note
      • 3" Oval Race Mufflers
      • Direct OEM Replacement Upgrade
      • 2-3/4" to 3" Stainless Steel Tubing
      • 4" Polished T304 Stainless Steel Tips
      • Fits 2011-2014 GT Mustangs


      Aggressive Exhaust Note. Give your 5.0 Coyote powered Mustang the loud aggressive exhaust note of a classic 60's muscle car with a Kooks Performance Axle-Back Exhaust system, that features stainless steel race mufflers.

      Durable Stainless Steel Construction. Constructed from 2-3/4" to 3" diameter stainless steel tubing for strength and corrosion resistance, this Kooks Performance Axle-Back exhaust system features two high flow 3" Oval Race Mufflers that end with 4" polished T304 stainless steel slant cut exhaust tips.

      Application. This Kooks Performance Axle-Back Exhaust Kit is specifically designed to fit the 2011-2014 GT Mustangs with the Coyote 5.0L 4 Valve V8 engine.

      Fitment: 2011 2012 2013 2014 Details

      Kooks 11406600

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Axle-Back Muffler assemblies

      Tech Specs

      Axle-Back Exhaust Specifications
      Piping Material: Stainless Steel Tip Material : Polished 304 Stainless Steel
      Piping Size: 2-3/4" to 3" Tip Size: 4"
      Muffler Type: Race Muffler Fitment: 2011-2014 GT Mustangs

      Customer Reviews (23)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 23 customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • May 14, 2018

        5 2014 GT - EmmettV

        Perfect sound

        I really like deep sound of these standing behind the car there is nothing tacky or to loud with these every generation can appreciate these exhaust had them on two days now and I’ve got really feed back from everyone who hears them ...even my wife likes them and she’s hard to win over on exhaust sounds

        Helpful (5)
      • December 08, 2017

        5 2015 GT - jasem Installation Time: Less than 1 Hour

        The best sound

        The sound to who look for mid sound also good when cold start

        Helpful (5)
      • August 16, 2017

        5 2013 GT - Codyc Installation Time: Less than 1 Hour

        not super loud at idle but loud enough

        these things are awesome! under throttle it comes to life and with no drone. i have cat deletes and over axle pipes and this thing sounds mean. i used to have outlaws and i couldnt here myself think but now you can old a conversation with your passenger and it still gets people looking at you when you drive by.

        Helpful (6)
      • June 23, 2017

        3 2014 GT - HaulingAssfault Installation Time: Less than 1 Hour

        All Looks -- no growl

        Not the sound I was hoping for. These are super DEEP like a freakin' tuba -- not the old school muscle car deep/rumble I was aiming for. And when you nail the gas they go quiet -- that's the worst part. Could be good for in town driving near the "man" I suppose. Very little drone which is a plus.

        Helpful (7)
      • June 17, 2017

        5 2012 Boss - John Installation Time: Afternoon

        Kooks axleback

        Put it on my 2012 boss. Added volume isn't that noticeable if your side pipes are open unless you're wot or in a tunnel for example. Way lighter and look 100x better than stock. Nice fit nice quality.

        Helpful (5)
      • May 27, 2017

        4 2011 GT - TtotheA Installation Time: Less than 1 Hour


        Like others searching for mufflers, I spent several hours listening to exhaust sound clips. My main focus was trying to find mufflers that would not be extremely loud. I was trying to decide between the ford sport, ford touring, or kooks axle back. The kooks axle back to me is slightly louder than stock. (exhaust sound is so subjective) It is a lot deeper at start up than stock. The kooks mufflers will growl more if you get the rpm(s) up. (still not loud). At cruise speeds they get quiet as stock. Minimal to no drone. On my vehicle everything is stock except for the mufflers, so I'm sure you can make the mufflers louder if needed. Install took about 45 minutes at the muffler shop. A little pricey for exhaust I'd say that is just a slightly louder than stock, but id rather have them a little too quiet rather than too loud. Overall, I'm satisfied and I like the deep/growl sound. The mufflers are deeper in person than the sound clips. Kooks mufflers keeps the car sounding nice....My 5.0 sounds a lot meaner now....GROWWWWLLLLL

        Helpful (8)
      • March 03, 2017

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

        Finally Perfect!!

        I got these yesterday...2 days after ordering and installed 'em in about an hour replacing my MagnaFlow Streets that were a little too quiet!! First startup they sounded GREAT with a little deeper sound and driving after warm up was JUST PERFECT!! GREAT TONE WITH NO DRONE!! Just what I was lookin' to sell the MagnaFlows!!

        Helpful (8)
      • February 26, 2016

        5 2012 GT - Hinely Installation Time: Less than 1 Hour

        Exactly what i wanted

        so i had the flowmaster outlaws which sounded great at WOT but they droned like nothing I had ever heard, so I ended up getting the Kooks and what a difference, they have a great start up tone and a decent sound with light revs. When driving down the road they have a nice steady rumble that wont make you go deaf but will definitely catch some attention. I would highly recommend these to anyone that wants a nice rumble. Finally WOT could be a little louder but I am happy with my purchase, always room to make them a little bit louder with other exhaust mods or engine.

        Helpful (6)
      • November 08, 2015

        5 2013 - Hulk302 Installation Time: Less than 1 Hour

        Kooks axle back sound growl!

        Installed these Kooks axle back on My '13 BOSS 302 because I heard them on another BOSS and they sounded tough. If you want that deep, throaty growl go with these! No drone either and much lighter than stock. Beautifully crafted stainless pieces to boot.

        Helpful (6)
      • August 28, 2015

        5 2014 GT - Guilly28 Installation Time: Afternoon

        Great axle back exhaust

        Kooks axle back exhaust was a great choice for me and my 2014 Mustang GT. I read a lot of reviews and listened to a lot of sound clips. I didn't want something crazy loud and I didn't want any drone on the highway. The Kooks axle back provided a deep exhaust tone during idle and a noticable difference during acceleration from stock and no drone cruising at highway speeds. I've gotten many compliments on the way they sound. The overall construction was great, almost to pretty to put under the car. Installation was a breeze.

        Helpful (7)

      Questions & Answers (6 answers)

      5 Top Rated Questions

      Stuck between two choices. I like these and the flowmaster outlaws. I like these looks better, but sound is more important to me than looks. The outlaws sound deeper than these just from online searches I mean. Anyone here familiar with both. I like loyd but not obnoxious. But I'm afraid this are more high pitch then deep. Can you help me out please. Thanks

      • Although I've never owned the Outlaws, I have had the Hushpowers, which is considerably quieter. That being said, I personally feel that the Outlaws would be too loud for a daily driver unless that's what you like - LOUD - all the time.The Hushpowers had a sort of deep tone, yet not near as deep in my opinion as the Kooks. I really didn't like the glasspack-type sound that the Hushpowers produced off-idle and above. They were very bubbly sounding to me. Not so with the Kooks system, just real muscle car sound. I believe the Outlaws, being a smaller muffler, would have to be much louder and tend to sound even more glasspack-like - popping, etc. Hope this helps!

      Helpful (4) Show 2 more answers

      Can these be paired with the BBK X-pipe #56112

      • Yes, this axle-back kit will essentially work with any x-pipe setup as there isn't a direct connection between the two. They will connect to the intermediate pipes/over-axle pipes which sit between them.

      Helpful (0)

      Are they chambered or straight flow mufflers?

      • The Kooks Performance Axle-Back Exhaust (11-14 GT) will have a straight flow design.

      Helpful (0)

      How do these compare to Magnaflow Street Axle Backs??

      • They are both pretty comparable in terms of sound, but quality-wise Kooks takes the cake. However, keep in mind you are comparing good to great, Magnaflow is still solid.

      Helpful (0)

      I am interested in purchasing an axel-back exhaust system for my 2014 GT 5.0. I want a deep throat guttural sound when idling and traveling at normal speeds. I don't race it and I don't want any pops or back fires. Is Kooks Performance Axle-Back Exhaust the best system to purchase?

      • Kooks Exhaust systems are designed to give you a deep throaty muscle car tone. This system gives you a terrific mix of agrressiveness and performance.

      Helpful (0)
      Post Your Question
      1 More Question
      Anyone know the HP increase with the Kooks exhaust? Just installed...LOVE the old school sound, deep idle w/o being obnoxiously loud. Great fit and finish. These must increase HP...just wondering by how much. 1 answer

      Will It Fit My Mustang

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

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