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Magnaflow Competition Cat-Back Exhaust (11-12 GT, GT500)

Market Price $1,302.53 You Save 32% ($414.44)
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  • Item 48038
  • MPN# 15590

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    Features, Videos & Details

    • Aggressive Musclecar Sound
    • 3" Mandrel-Bent Tubing
    • Stainless Steel Construction
    • 4" Polished Tips
    • Fits 2011-2012 GT or GT500 Mustangs

    Review & Installation Video

    Hey, Justin here with, taking a closer look at Magnaflow’s competition series catback exhaust fitting all 2011 and newer Mustang GTs. The competition series continues to be a popular choice here on the site, thanks in part to it’s very aggressive tone, along with the solid performance gains this kit offers. The system is constructed from 100% stainless steel and features 3” mandrel bent tubing which is going to be the norm for the majority of aftermarket catbacks for the 2011 and up Mustangs. That aggressive tone comes from these competition series mufflers, which feature a straight through design, really freeing up that exhaust flow. Finally, everything exits out these hand polished 4” tips. As far as price is concerned, you’ll find the competition series to be in the mid to high side of the price range, but still not as expensive as some other exhausts on the market. Getting this catback installed is fairly straightforward, and should take you about 2 hours using standard hand tools. Now let’s hear how Magnaflow’s competition series sounds compared to our factory exhaust.

    See our 2011 GT Project Car Now

    Add Horsepower. Stop choking your 5.0 with a stock exhaust and enjoy more horsepower with a Magnaflow Competition Cat-Back. By reducing backpressure and giving your Mustang GT or GT500 a free-flowing exhaust, you'll see great power and torque gains. In fact, our 2011 Project car has this same system with the off-road x-pipe, and was dyno tested with a peak gain of 19 RWHP and 18 ft-lb of torque. Plus, you'll set the stage for future mods.

    Aggressive Musclecar Sound. Give your 2011-2012 Mustang GT a deep, aggressive rumble that will make lesser cars clear a path at lights with a Magnaflow Competition Cat-Back. This premium quality exhaust features free-flowing, straight-through mufflers that increase power and give your GT or GT500 an unmistakable musclecar sound.

    Magnaflow Quality. Each piece is made from 3" mandrel bent stainless steel tubing for long life and a perfect fit. The straight-through mufflers end with brightly polished 4" stainless tips that exit in the stock locations for impressive styling.

    Application. Made to be a direct bolt on, this catback will bolt straight up to the factory Mid-Pipe without any extra modifications required on your 2011 or 2012 Mustang GT or GT500 to give it the deepest, most aggressive sound possible.

    Note: Coupon codes cannot be applied to this product.

    Fitment: 2011 2012 Details

    What's in the Box
    • (2) Muffler assemblies/li>
    • (2) Over axle pipes
    • (4) Clamps
    Installation Info
    Tech Specs
    Cat-Back Exhaust Specifications
    Piping Material: Stainless Steel Tip Material : Polished Stainless Steel
    Piping Size: 3" Tip Size: 4"
    Muffler Type: Straight-through Fitment: 2011-2012 GT or GT500 Mustangs
    Will it fit my Mustang?

    Customer Photos (9) Submit Your Photo

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    7 Questions / 6 Answers

    Ask a Question

    Will this fit a 2013 GT Will this Catback Exhaust kit fit a 2013 Mustang GT?


    • Unfortunately, it will not fit the 2013 GT. Magnaflow has totally separate systems created for the 2013 models. We are set to have them available on the site in the very near future!


    Helpful (2)

    will I benefit with a tune when adding this


    • You would not need a tuner when doing a cat-back set up. However anytime doing a tuner will greatly improve your car!


    Helpful (0)

    Does this set up require a tune?


    • The Magnaflow Competition Cat-Back Exhaust does not require a tune.

      Rob D

    Helpful (0)

    Whats the approximate performance gains provided by the exhaust system.


    • Hello! The advertised gains are 17 Horsepower & 15 Torque!

      Doug P

    Helpful (0)

    Decibel (db) What is the db of magnaflow competition catback exhaust and the db of street catback street exhaust . Thank


    • Unfortunately, we do not have the decibel readings for the Magnaflow Competition Catback Exhaust or the Magnaflow Street Catback Exhaust on a stock vehicle, we apologize.


    Helpful (0)

    Is any pipe size catback can fit on V6? I have a 2014 V6. what pipe size cat back exhaust i cant pick?


    • Hi, This Magnaflow Competition Cat-Back Exhaust will only fit on 11-12 GT and GT500 Mustangs, 13-14 V6 Mustangs use 2.5" piping, i suggest the Magnaflow Competition Cat-Back Exhaust - 4 in. Tips Item #48055 it is for 13-14 V6 Mustangs. Here is the Link

      Chris J

    Helpful (0)

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    Customer Reviews (21) Write a Review

    Overall Rating 4.5

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Loudness / Volume 4.5 4.5
    • Exhaust Note 4 4
    • Fit & Finish 3.625 3.6
    • Bang For Your Buck 3.5 3.5

    • 5/5

      August 01, 2016


      If you want loud , and some high quality piping at a great price , buy these . You won't be disappointed . The finish on the piping is great, comparable to Kooks, they're 3" all the way through , frees up power , looks great and sound amazing .


      Year: 2012 Submodel: Boss

      Helpful (3)

    • 1/5

      August 16, 2013

      car bottoms out

      I love everything about the exhaust except the fact that the differential smacks into the exhaust non stop. I even had ford take a look and they couldnt adjust it. I also have j and l lower control arms and eibach suspension which i got after i installed the exhaust. The car bottomed out even before i installed the suspension but after the new suspension was intalled its even worse. If anyone has any ideas please let me know. I plan on putting the stock control arms back on and seeing if that helps. Other than that the exhaust is great but it is a deal breaker. If i had to do it again i wouldnt buy this oroduct.... would love an answer to this.


      Year: 2012 Submodel: GT Long Beach, NY, USA

      Helpful (4)

      • Response from AmericanMuscle

        I would highly suggest contacting Magnaflow directly. They prefer to handle their own warranty issues and they would be able to assist you best in finding a feasible solution to this problem. They can be reached at 1800-824-8664 Mon-Fri 7:30-5pm PST. If after talking with Magnaflow you are still experiencing an issue, please don't hesitate to give our Customer Service a call and we will do all we can to help!

        Lisa, Customer Care

    • 5/5

      Installation Time: Less than 1 Hour

      April 21, 2013

      Awesome Sound

      Added this to my 2012 as a first upgrade to my stang and wow! Straight head turner and after having it on there for almost 2 weeks, I turn heads and get compliments from random people. Def a must for a 5.0 owner


      Year: 2012 Submodel: GT Beavercreek, OH, USA

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      January 10, 2013

      Awesome sound

      Great sounding exhaust. I cannot believe how long I left the stock exhaust on the car this magnaflow exhaust really makes it sound like a muscle car. Bang for your buck. Installation took longer then expected other than that a must have


      Year: 2012 Submodel: GT New Jersey

      Helpful (3)

    • 2/5

      Installation Time: Afternoon

      August 18, 2012

      WARNING!! Not for lowered stangs.

      Install is as described by others. Getting out the stock stuff is harder than putting this on. Sounds good and just loud enough but one MAJOR problem. I installed Eiback Pro-Kit springs and now even with stock bump stops, the axle hits the exhaust tubes even over small speed bumps. I've adjusted it to best case which has left my talipipes crooked and looking horrible, but is just plain engineered wrong and doesn't leave room for suspension travel. Im now constanlty on the brakes everytime I see any bump to try and avoid my new 2012 GT sounding like a budget junkyard build. If you want to lower you car (and they need it to look decent) shop for another system.


      Year: 2012 Submodel: GT

      Helpful (3)

      • Response from AmericanMuscle

        I'd suggest taking your Mustang to a local shop to get it looked over. I haven't heard of this problem in the past and they should be able to make some adjustments for you! Hope this helps!

        Lisa, Customer Care

    • 3/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      August 01, 2012

      Magnaflow Comp

      I think that this cat-back is good for louder than stock but if your going headers x-pipe I would turn my head and look elsewhere...I think that most would consider this exhaust to be way too loud for daily drivers. I still think it would be ok with stock headers and mid-pipe.


      Year: 2011 Submodel: GT

      Helpful (3)

      • Response from AmericanMuscle

        Any time an x-pipe is combined with an aggressive catback system, it will be very loud! Catted x-pipes would be slightly less raspy and loud as an off-road version. You could combine the catback with an h-pipe to tone down the rasp and give you more of an old school, deep muscle car sound.

        Lisa, Customer Care

    • 5/5

      Installation Time: Less than 1 Hour

      May 03, 2012

      Best 1st Mod for Any 2011 5.0

      Absolutely awesome. 1 HR install. Perfect fitment. Sounds like a race car. Definitely freed up some horses. This is what this Pony is supposed to sound like. Love the throttle response. Falls back to idle a bit faster and pops as it does. Just what I wanted.


      Year: 2011 Submodel: GT Bath, ME

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      April 25, 2012

      AGGRESSIVE Sound!

      Probably the best sounding system for the 5.0 in my opinion, anyway. Paired it up with the Tru-X X -pipe and the car really woke up! There is a fair amount of drone though, which is something to be aware of. But if it doesn't bother you, definitely consider this system. Tone is loud and deep, yet smooth and actually surprisingly controllable.


      Year: 2011 Submodel: GT Milwaukee, WI

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      March 26, 2012

      Great Sound

      Just bought these with out the X Pipe. They sound great and give your stang a good throaty sound. Wish that NY would allow the X pipes because i would love to hear my baby whine. Little bit expensive and had to have ford install them so it ended up being 1000+.


      Year: 2012 Submodel: GT

      Helpful (3)

    • 5/5

      August 21, 2011

      You want it loud?

      Could not hear car well enough to shift as desired before; no problem now... My 2012 5.0 sounds mean and lets you know it is not a stock GT. Be aware that it can be loud enough to cause problems with sync voice commands (I have to let off gas and hold in clutch to get it quiet enough to say a command)If you want loud and mean muscle car sound this is your exhuast.


      Year: 2012 Submodel: GT

      Helpful (11)

    • 5/5

      June 15, 2011

      Great sound!

      Great product. Well worth the money! If you don't have access to a lift find one! Nearly impossible to get factory mid pipe over the rear end to remove without a lift! But I love it now that it's on!

      Josh Crowe

      Year: 2011 Submodel: GT

      Helpful (4)

    • 5/5

      June 11, 2011

      Loud and Bad@ss

      Loud is an understatement.... I love this exhaust because the car sounds mean. This plus a CAI and Tune makes this car a true BEAST. You can hear this combo blocks away so if you are afraid of a loud super aggressive bad@ss exhaust look elsewhere.

      Brian Palmer

      Year: 2011 Submodel: GT

      Helpful (9)

    • 5/5

      June 09, 2011

      Great Exhaust

      I love this exhaust and I am sure my neighbors do not :) Loud might be an understatement, you can hear the rumble a couple blocks away when under throttle. If you are not looking for a loud exhaust then do not get this one...

      Brian Palmer

      Year: 2011 Submodel: GT

      Helpful (4)

    • 5/5

      June 09, 2011

      Sounds like a supercharger!

      I noticed a better throttle control with this combo. Car has a slight whine/whistle now just like a supercharger. I have had people ask if I have a supercharger. Well worth the money!!

      Brian Palmer

      Year: 2011 Submodel: GT

      Helpful (9)

    • 5/5

      May 29, 2011

      perfect 5.0 sound

      Man, what a difference. Woke up the 2012 gt/cs. thanks magnaflow.


      Year: 2012 Submodel: GT

      Helpful (3)

    • 5/5

      May 25, 2011

      Catback Exhaust

      I am extremely satisfied with the exhaust. I love the rumble sound. I had the high school auto shop install the system and it only took them 1 class to install(around 90 minutes) The kids loved installing it and they loved the sound also.

      Joe Kerrigan

      Year: 2011 Submodel: GT

      Helpful (6)

    • 5/5

      May 05, 2011

      truly excellent sound

      Had a Pypes Mid Muffler on my 08 Stang.I thought that sounded great.Wait until you get this one on.Has a wonderful tone to it, that iv'e never really heard before.Can't go wrong with Magnaflow.Took about an hour for a mechanic to bolt on.The looks you get from people when you get on it are great.


      Year: 2011 Submodel: GT

      Helpful (7)

    • 5/5

      April 23, 2011

      2011 Mustang GT Exhaust

      This exhaust is for people that want an agressive exhaust, power, and a nice deep rumble in the lower RPM's. In the higher RPM's it screams. Not for those that want just a little more rumble.

      Daniel A.

      Year: 2011 Submodel: GT

      Helpful (5)

    • 5/5

      March 22, 2011

      GREAT SOUND!!!!

      Sounds Great and looks great!!! Has very deep rumble and aggressive note! If you want a louder aggressive tone I would surely recommend!!! Not for someone looking for slightly louder than stock exhaust.

      Kyle Fisher

      Year: 2011 Submodel: GT

      Helpful (6)

    • 5/5

      December 05, 2010

      Good sound

      this exahust kit bring the muscle sound out of the 5.0 the very system to have.


      Helpful (8)

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