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Flowmaster Outlaw Axle-Back Exhaust (13-14 GT)

Item 18445
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      Review & Installation Video

      Hey I'm Justin with, and this is my brief look into the Flowmaster Outlaw series axle back, fitting all 2013 Mustang GTs, and GT500's. If you're looking for a system that will really allow your 5.0 or 5.8L to be heard, then this is it, Flowmaster calls this their most aggressive axle back available for the new V8's, thanks to the two Outlaw series straight through mufflers, that should really help uncork the exhaust flow. Like many other Flowmaster exhaust, the Outlaw series is constructed using durable 409 grade stainless steel, and does feature 2.5" mandrel bent tubing. The exhaust is also finished off in that sleek black finish, which is great at resisting corrosion. Finally, everything exits out these dual 4" tips embossed with that iconic Flowmaster logo. Installation on this axle back is very straightforward and should only take you about an hour in the driveway using basic hand tools. Now let's hear how Flowmaster's Outlaw series axle back sounds compared to our factory exhaust.

      Product Information

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


      • Super Aggressive Flowmaster Outlaw Sound
      • Durable 409 Stainless Steel Construction
      • 2.75" Mandrel-Bent Tubing
      • 4" Polished Stainless Steel Tips
      • Flowmaster Outlaw Mufflers
      • Fits 2013-2014 GT and Boss Mustangs


      Super Aggressive Flowmaster Sound. Give your Coyote powered Mustang that unmistakable Flowmaster sound with the Outlaw Series Axle-Back Exhaust System from AmericanMuscle. This system improves exhaust flow using Flowmaster's race-oriented style Outlaw mufflers for that super, aggressive exhaust note your high powered Pony deserves.

      Stainless Steel Construction. Constructed from durable 2.75" 16 gauge 409 stainless steel tubing for it's corrosion resistant properties, the Flowmaster Outlaw Axle-back features two race-oriented mufflers with massive 4.0" diameter polished stainless steel tips for impressive muscle car looks and sound. As an added bonus the tips are embossed with the "Flowmaster" logo for true custom styling.

      Application. This Flowmaster Outlaw Series Axle-Back Exhaust System is designed to fit the 2013-2014 GT and BOSS Mustangs for both great looks and great sound. Reuses the factory clamps for installation.

      Fitment: 2013 2014 Details

      Flowmaster 817592

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 100+ customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • April 10, 2020

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

        My flowmaster outlaw

        It's a nice loud it's not a crazy loud it catches peoples eye when I drive thru or drive by ...

        Helpful (3)
      • February 08, 2020

        4 2013 GT - g Installation Time: Afternoon

        Great sound

        I love my exhaust note now! Originally bought these for my 05 GT, but they droned a bit. I bought them for my 13 GT and they actually sound much better. There's still a bit of droning at low rpm, but nothing I can't live with.

        Helpful (3)
      • January 11, 2020

        5 2014 GT - GAS65 Installation Time: Weekend

        Love it

        my husband bought these and surprised me for my birthday, I love the sound, my mustang sounds much more aggressive.

        Helpful (4)
      • December 23, 2019

        5 2014 GT - Dmadlock123 Installation Time: Afternoon

        Flowmaster Outlaw Axle-Back Exhaust (13-14 GT)

        I have had these on my 07 GT premium and now my 14 Coyote And the way these sound on the coyote is just demonic... guys that are completely stock out there and think these may not wake the sound and volume up, don’t worry they are LOUD. Best sounding exhaust for the 5.0 in my opinion as I’ve heard others in person. Just makes driving the car 10x more fun in any situation.. yes there is drone but I am the guy who LOVES the drama of the drone.

        Helpful (4)
      • September 17, 2019

        5 2014 GT - Coyote14 Installation Time: Less than 1 Hour


        But one tip was welded deeper then the other so pipes not even on the exit!

        Helpful (5)
      • June 03, 2019

        5 2013 GT - AdaGT3 Installation Time: Shop Install

        Sounds great!

        Love the way my car sounds now, this is what I was looking for. I recommend others to buy them

        Helpful (4)
      • March 22, 2019

        5 2013 GT - Juned Installation Time: Afternoon

        V8 Power

        This is loud and everyone knows whenever I have parked in the driveway, if you're looking for an exhaust that isn't breaking the bank but superior quality this is it!

        Helpful (4)
      • March 13, 2019

        5 2014 GT - William Installation Time: Shop Install Installation Cost: $100-$250


        Bought these for my 2014 GT and they do not disappoint ! Loud and sound fantastic when you let the horses out of the barn! I love them. A little droning @ 2200rpm but, I can live with it! Happy about my purchase!

        Helpful (3)
      • March 08, 2019

        5 2014 GT - Chris12harley Installation Time: Less than 1 Hour


        Awesome sound especially during acceleration so worth the price

        Helpful (3)
      • March 07, 2019

        5 2013 GT - WalterB Installation Time: Shop Install Installation Cost: $100-$250


        I could not be happier with my purchase! It feels like a new car all over again!! I had Flowmaster 40 series but they left me wanting more. The Outlaws fixed that!!! The sound is nasty mean and the drone isn't near as bad as I expected!! It's loud but not too uncomfortably loud. I had a conversation with the passenger the whole way no problem! This is a steal of a deal for the price! I 1000 would recommend to mustang owners!!

        Helpful (3)

      Questions & Answers (22 answers)

      5 Top Rated Questions

      I have a 2010 v6mustang I know the piping is 2.5 with stock but can I get a bigger pipe as well so it fits the 2.75 cause these sound so amazing and I really want to run them

      • Yes you are able to fabricate the exhaust to work together if you do not mind doing a little custom work, however as a heads up these will not sound the same on your V6 as they do on a Mustang GT.

      Helpful (2)

      What do I need to be able to put these on my 2014 V6?

      • Unfortunately, this Flowmaster Outlaw Series Axle-Back Exhaust is specifically designed for use on 13-14 GT model Mustangs and would not fit properly on 13-14 V6 model Mustangs.

      Helpful (1)

      I have kooks longtubes, off-road x pipe and Magnaflow rtr mufflers currently. If I were to change out my current axle back with this. What would it sound like? And also would it lose too much or if any back pressure?

      I’m looking to purchase these mufflers second hand and the person selling them as them listed for the 2005-2009 and I have a 2013 gt Will these they’ll work out and will the sound be the same or are they different

      • The 05-09 model of this system will not fit 13-14 models.

      Helpful (0)

      My brother says he had these for his old car (08’ GT) and got a serious drone while at highway speeds, so much that people wouldn’t ride in the car if they knew it was getting on the highway. Are these exhausts any different from the ones that would go on at 08’ GT? Could they potentially not have the same drone at highway speeds?

      • Exhaust drones are possible with any aftermarket exhaust. Exhaust drone is primarily the result of sound waves traveling through the air and vibration that is transferred through a vehicle's frame, body and components. Different tips, mufflers, and exhaust pipe size can either create or get rid of exhaust drone. There is some drone associated with theFlowmaster Outlaw Axle-Back Exhaust for a 2013-14 GT, but overall due to the different body and design the drone between the 13-14 GTs and an 08 GT would not be the same. 

      Helpful (0)
      10 More Questions
      How much of a sound difference is there between the flowmaster outlaw axle back and the cat back? 1 answer
      Will these fit on 2012? 1 answer
      Are they legal in California 1 answer
      Do this come with dual tip, so it can go with my GT500 valance ? 1 answer
      Hi. In the customer reviews there are a lot of comments about the droning sound at approx 2000 revs. Do you have any recommendations to prevent / limit this? I am keen to buy this product but cautious about the droning. 1 answer
      I am installing the Flowmaster axle back on my 2013 GT will this increase my horsepower 1 answer
      Will these bolt up to a pypes catback exhaust 3in tubing? I would like to replace my pypes axleback mufflers for something louder and I'm wondering if these will bolt right up or would I need some adjustment to be done? 1 answer
      Why are clamps not included in this kit? 1 answer
      I have a 2012 gt will it still fit because it says (13-14 gt)before i buy? 1 answer
      By any chance could this exhaust fit my 2014 v6 mustang? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Muffler assemblies

      Tech Specs

      Axle-Back Exhaust Specifications
      Piping Material:409 Stainless Steel Tip Material :Polished Stainless Steel
      Piping Size:2.75"Tip Size:4.0"
      Muffler Type:Straight-throughFitment:2013-2014 GT, BOSS

      Will It Fit My Mustang

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