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

Item 48038
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      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.

      Product Information

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


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


      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

      MPN# 15590

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (21)

      Write a Review

      Ratings Summary

      4.5 out of 5 overall rating from 21 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • August 01, 2016

        5 2012 Boss - Boss12


        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 .

        Helpful (6)
      • August 16, 2013

        1 2012 GT - xvsanlax

        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.

        Helpful (6)
      • April 21, 2013

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

        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

        Helpful (5)
      • January 10, 2013

        5 2012 GT - Stangand Installation Time: Afternoon

        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

        Helpful (5)
      • August 18, 2012

        2 2012 GT - bad302 Installation Time: Afternoon

        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.

        Helpful (5)
      • August 01, 2012

        3 2011 GT - bradd33 Installation Time: Shop Install Installation Cost: $100-$250

        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.

        Helpful (5)
      • May 03, 2012

        5 2011 GT - Mainer Installation Time: Less than 1 Hour

        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.

        Helpful (6)
      • April 25, 2012

        5 2011 GT - nsastang87xx Installation Time: Less than 1 Hour

        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.

        Helpful (3)
      • March 26, 2012

        4 2012 GT - Dranger Installation Time: Afternoon

        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+.

        Helpful (5)
      • August 21, 2011

        5 2012 GT - robert

        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.

        Helpful (14)

      Questions & Answers (8 answers)

      5 Top Rated Questions

      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 this work with Kooks 1-7/8 long tube headers and Kooks O/R midpipe. ?

      • Yes, this exhaust is compatible with the Kooks long tube headers and off-road mid-pipe.

      Helpful (0)

      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.

      Helpful (0)

      Whats the approximate performance gains provided by the exhaust system.

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

      Helpful (0)
      Post Your Question
      3 More Questions
      Decibel (db) What is the db of magnaflow competition catback exhaust and the db of street catback street exhaust . Thank 1 answer
      Is any pipe size catback can fit on V6? I have a 2014 V6. what pipe size cat back exhaust i cant pick? 1 answer
      will this cat back system work with the bbk long tube headers and the bbk shorty off road x pipe 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Muffler assemblies/li>
      • (2) Over axle pipes
      • (4) Clamps

      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

      • Boss 302 - 12
      • GT - 11, 12
      • GT500 - 11, 12

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