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Magnaflow Competition Series Cat-Back Exhaust (15-17 GT)

Item 389031
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      Review & Installation Video

      Hey, everybody. Justin with, here with my complete breakdown of the Magnaflow Competition Series Catback Exhaust System fitting your 2015 Coyote powered GT.Magnaflow has definitely made a name for themselves over the past 30 or so years, as one of the best in the biz, thanks largely in part to their quality build, great sound and perfect fitment.The Competition Catback from Magnaflow will no doubt be one of the more aggressive systems available for your Coyote Powered GT, and will certainly be much more aggressive when compared to the Magnaflow Street Catback.The main difference in sound is simple; it's in the muffler here. This is a straight-through design which will not only free up a lot of power, but also give you that very tough sound a lot of us Mustang owners are after.Getting into some of the specifics, you will notice the competition includes 3-inch mandrel bent tubing from the included crossover, or X pipe, which does take the place of that factory suitcase portion of your exhaust, along with these straight-through competition mufflers and out the brightly polished, rather large, four-and-a-half inch tips.I do want to point out that this entire kit has been constructed from 100% quality stainless steel. So besides looking good for years to come, you're also going to save a few pounds when compared to your factory, rather hefty, exhaust there.Now guys, if you do want to see more detailed photos of this exhaust including some customer reviews, then just click on the link below to head back to the product page, if you're not already there.Since the 2015s are equipped with IRS, removing the old exhaust and bolting up the new Catback should be a lot easier than previous generations, thanks largely in part that you don't have to deal with those over-axle pipes. With that being said, removing that factory exhaust and installing the new Competition here from Magnaflow, should only take you about two hours using basic hand tools.Now it's time to hear how the Magnaflow Competition Catback sounds compared to our factory exhaust.

      Product Information

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


      • Aggressive Muscle Car Sound
      • Stainless Steel Construction
      • 3" Mandrel-Bent Tubing
      • 4.5" Polished Stainless Tips
      • Fits All 2015-2017 GT Mustangs, Including Fastback and Convertible


      Add Horsepower. Stop choking off your high powered 5.0L V8 with a factory exhaust system and enjoy more horsepower with a Magnaflow Competition Cat-Back. By reducing back pressure and giving your GT Mustang a free-flowing exhaust, you'll see great power and torque gains.

      Aggressive Muscle Car Sound. Give your coyote powered 2015-2017 GT Fastback the deep, aggressive rumble it deserves with a Magnaflow Competition Cat-Back. This premium quality exhaust features free-flowing, straight-through mufflers that increase power and give your GT an unmistakable muscle car sound.

      Magnaflow Quality. Constructed from durable 3" diameter mandrel bent stainless steel tubing for it's corrosion resistant properties, this Magnaflow Cat-Back features two straight-through mufflers with brightly polished 4.5" stainless tips, that exit in the stock locations for impressive muscle car looks and sound.

      Application. Made to be a direct bolt on, this Magnaflow Competition Cat-Back Exhaust will bolt straight up to the factory Mid-Pipe without any extra modifications required on the 2015-2017 GT Mustang to give it the deepest, most aggressive sound possible. This Magnaflow Competition Cat-Back Exhaust fits both the fastback and convertible models.

      Technical Notes. AmericanMuscle recommends professional installation of all body parts. We also recommended test fitting these products before they are painted.

      Freight Notes. Freight items can only be shipped within the continental 48 states, no expedited methods. What is freight shipping? Your Answers are Right Here!.

      Fitment: 2015 2016 2017 Details

      MPN# 19101

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (55)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 55 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • February 15, 2020

        5 2016 GT - Matt2 Installation Time: Afternoon

        Helpful (0)
      • January 30, 2020

        5 2016 GT - 702PNY Installation Time: Shop Install Installation Cost: $100-$250

        Old School Sound

        I have a 2016 GT and after hearing other 5.0's around town I decided to go old school and look for the deep tones. It definitely is a head turner for sure. There's some drone but I don't mind it, it's a great reminder of having a V8. Not sure how my neighbors feel about the noise in the morning but it doesn't really matter it guess.

        Helpful (0)
      • July 14, 2019

        5 2015 GT - BertH Installation Time: Afternoon

        Unique Sound

        Love the Exhaust! Wish the drone wasn't so bad. Definitely takes some getting used to. Overall doesn't sound like all other mustangs. 1.5 install time. Having a lift is a life saver!

        Helpful (0)
      • January 13, 2019

        5 2017 GT - TylerB Installation Time: Afternoon

        Magnaflow competition cat back

        Extremely impressed with the cat back. Its loud but doesnt scream like the corsa. Has a way deeper tone over factory. Its just phenomenal.

        Helpful (3)
      • September 02, 2018

        5 2015 GT - WayneE

        Beauty is a Beast

        An aggressive rumble announces your arrival and departure...others know it's all business

        Helpful (5)
      • July 29, 2018

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

        Great Muscle Car Sound

        Wonderful product; Great quality and awesome sound; Really what a 5.0 needs to sound alive!!

        Helpful (4)
      • July 02, 2018

        5 2017 GT - ErikD Installation Time: Less than 1 Hour

        Great sound

        Was nervous this system would be too loud for a daily driver but wanted a deep full sound. This system delivers there are moments where it gets loud inside but it’s never too much to enjoy. Would highly recommend this exhaust if you’re looking for a deep sound and rare moments of rasp.

        Helpful (8)
      • June 25, 2018

        5 2017 GT - RickA Installation Time: Shop Install Installation Cost: $100-$250

        Just Bitchin

        I was on the fence when it came to choosing an exhaust for my '17 GT PP. It ultimately came down to Magnaflow Competition cat back or Borla Attak...I went with the Magnaflow. I couldn't be any happier, I chose MF because of the reviews. Reviewers stated it was a classic low rumble, while Borla was a screamer. My wife was a screamer, she made me crazy. Anyway, yes there is the drone at 1900 rpm. But you know what??? I don't care (it really isn't that bad, in fact I love it), it just assures me that that bad Coyote sitting under the hood has just been uncorked...Just the tip of the iceberg here, great plans in store for my sexy beast. I did not buy my exhaust from AM, however the rest of my dream list will come from them. This exhaust did not disappoint, and I honestly feel that I made the right decision, and I would do it again.

        Helpful (6)
      • March 31, 2018

        4 2016 GT - Brady Installation Time: Shop Install Installation Cost: 0-$100

        Incredible Sound...horrible drone

        The sound that this cat-back produces is absolutely incredible. It's a deep throaty rumble that never gets too raspy. In my opinion, this is the best sounding cat-back available for the S550. However, at lower RPM's, the intense drone is almost unbearable. After 3 days, I developed horrible ear pain and had to replace the factory resonator but left the axle-back portion. Fortunately, the deep rumble that makes this exhaust sound so good stays relatively intact with just the axle-back, but with a much more subdued cabin drone. If you intend to use this as a daily driver, I would strongly consider looking into the axle-back option.

        Helpful (9)
      • March 27, 2018

        5 2017 GT - DennisO Installation Time: Afternoon

        Awesome sound

        Very easy to in stall I had put the car up on Jackstands undid 6 bolts from the stock exhaust and took off the exhaust. Putting the new exhaust on was an ease by filling the YouTube video. Love the way my car sounds only thing I don't like is there is a drone at certain rpms but I just turn up the radio and all. Is good

        Helpful (4)

      Questions & Answers (14 answers)

      5 Top Rated Questions

      how much horsepower will it add to my 2015 mustang 5.0 gt

      • Hi, This Magnaflow Competition Cat-Back Exhaust by its self will at most add 1-3 HP.

      Helpful (6)

      I own the ecoboost version with the Ypipe. My question is can i just purchase an Xpipe that can just be swapped out to fit my ‘16 GT? If so can u recommend some?

      • No, sections of EcoBoost exhausts will not transfer directly to the GT platform with the addition of a y-pipe portion.

      Helpful (0)

      I bought a 2017 GT with this already on. Are there magna flow or other mufflers I can add to decrease the sound while not causing too much flow restriction?

      Thinking about going with the Magnaflow Competition catback for my 2016 GT convertible. I’m concerned about the drone but I figured with the convertible the drone should be a bit diminished. Wondering if my thinking is correct?

      • We would not be too concerned with drone when using this exhaust on your convertible. That will be an awesome set up!

      Helpful (0)

      will this system bolt up to a 3 inch catless bbk mid pipe in to long tubes I have a corsa catback on it going into long tubes currently . wondering if I will need to do any cutting or welding ?

      • The Magnaflow Competition Cat-Back Exhaust will be compatible with your current exhaust setup.

      Helpful (0)
      Post Your Question
      9 More Questions
      Are they any difference with this setup compared to the RTR competition setup? I know both are made by MagnaFlow but curious about the difference on the sound. TIA 1 answer
      How much louder is the competition compared to the Magnaflow Street? I really wanna have a deep sporty sound but I don't want to wake up my neighbours every time I get home. Some youtube comments said "Nice exhaust which is not too loud when idle", but I can't really tell what that means. Can you maybe somehow tell me the min/max between stock exhaust/Magnaflow Street cat-back/Magnaflow Competition cat-back? I hope I don't ask for too much :D. 1 answer
      Will this exhaust fit my 2016 mustang gt convertible? 1 answer
      I have the maganaflow street catback and I was wondering how much more drone the competition gets compared to the street version? I'm thinking about upgrading to the competition axle-backs 1 answer
      I purchased and installed the street series cat back system on my 15 gt and was wondering if I would be able to purchase just the competition muffler to switch out with the street, without buying the complete system. 1 answer
      what happens if i put this on a v6 2016 ford mustang ? 1 answer
      I saw a review down in the comments that said he had to do some cutting? So is there cutting required on this? I didn't think there was but I want to be sure. 1 answer
      What kinda of MPG can I expect with moderate driving and with spirited driving? 1 answer
      What headers/long tube systems will pair well with this? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Right muffler assembly
      • (1) Left muffler assembly
      • (1) Right tailpipe assembly
      • (1) Left tailpipe assembly
      • (4) clamps

      Tech Specs

      Cat-Back Exhaust Specifications
      Piping Material:Stainless Steel Tip Material :Polished Stainless Steel
      Piping Size:3"Tip Size:4.5"
      Muffler Type:Straight-throughFitment:2015-2017 GT

      Will It Fit My Mustang

      • GT - 15, 16, 17

      Fits both Fastback and Convertible models

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