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Flowmaster Outlaw Axle-Back Exhaust (15-17 GT)

AmericanMuscle no longer carries the Flowmaster Outlaw Axle-Back Exhaust (15-17 GT). Please check out 2015-2019 Mustang Axle-Back Exhaust for an updated selection.

Features & Details

  • Super Aggressive Flowmaster Outlaw Sound
  • Durable 409 Stainless Steel Construction
  • 3" Mandrel-Bent Tubing
  • 4" Polished Stainless Steel Tips
  • Includes Two Flowmaster Outlaw Mufflers
  • Compatible with Fastback and Convertibles
  • Fits 2015-2017 GT Mustangs
Super Aggressive Flowmaster Sound. Give your coyote powered S550 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 3" 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.

Cut & Clamp Installation. The installation of this Axle-Back Exhaust requires cutting and removing the stock muffler assemblies, and clamping the new muffler assemblies in place. Clamps and instructions are provided.

Application. This Flowmaster Outlaw Series Axle-back exhaust system is designed to fit both fastback and convertible 2015-2017 GT Mustangs for both great looks and great sound.

Fitment: 2015 2016 2017 Details

MPN# 817732

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

What's in the Box
  • (2) Muffler assemblies
Installation Info
Tech Specs
Axle-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished Stainless Steel
Piping Size: 3" Tip Size: 4.0"
Muffler Type: Straight-through Fitment: 2015-2017 GT
Will it fit my Mustang?

    Customer Photos (51) Submit Your Photo

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      Questions & Answers (34)

      5 Top Rated Questions

      Will this axle back fit with the ford performance x pipe with side exhaust on my 2015 mustang gt premium performance pack?

      • The Flowmaster Outlaw Series Axle-Back Exhaust will have no issues working with that setup.

      Helpful (3)

      any drone?

      • While a subjective measure, this exhaust is widely considered one that has some drone.

      Helpful (2)

      Can i fit this with any H-pipe? any recommendations as to which H-pipe?

      • The Flowmaster Outlaw Series Axle-Back Exhaust will work with any H pipe or X pipe we offer. Brand choice will come down to personal preference.

      Helpful (1)

      will this bolt up if i have magnaflow competition catback installed?

      • The Flowmaster Outlaw Series Axle-Back Exhaust is designed to connect directly to the OEM catback, and would not be compatible with aftermarket catbacks such as the Magnaflow Competition Catback.

      Helpful (1)

      Will this fit any resonator delete x pipe

      • This Flowmaster Outlaw Series Axle-Back Exhaust would mount up to the stock exhaust locations, which most x-pipes would reuse.

      Helpful (1)
      Post Your Question
      10 More Questions
      Are the tips 304 or 409 stainless steel? 1 answer
      Anything else needed to put these on my mustang 0 answer
      What is the decibel rating for this exhaust? Just the axle back with no other exhaust modifications 0 answer
      I have a 2017 mustang ecoboost and I’ve seen videos of this on an ecoboost, but this says it won’t fit my car? 1 answer
      I previously bought the “https://www.americanmuscle.com/mbrp-stainless-street-catback-2015gt.htm” and am looking at getting this and swapping it out. Will it work with that H-pipe? 1 answer
      will this fit a 2016 v6? 1 answer
      Is ther one that will fit a 2014 mustang v6? 1 answer
      Will this clamp up to the sr x-pipe? 1 answer
      Does the addition of this exhaust increase HP? Even slightly? 1 answer
      Hello, I noticed a previous review stating that this Flowmaster had issues with being compatible with the GT Premium "convertible". The person writing the review said the muffler didn't fit and rattled when going over bumps. Is this accurate? 1 answer

        Customer Reviews (100+) Write a Review

        Overall Rating 4.8

        out of 5 stars

        Installation Time:Afternoon

        Installation Cost:$100-$250

        • Loudness / Volume 4.788546 4.8
        • Exhaust Note 4.859031 4.9
        • Fit & Finish 4.678414 4.7
        • Bang For Your Buck 4.837004 4.8



        • 5/5

          Installation Time: Shop Install

          Installation Cost: $100-$250

          April 05, 2019

          Loud deep tone

          I was looking to get a loud but deep exhaust sound and this is it. You can hear some drone if you’re in sixth gear under 3k RPM, but besides that it’s a beautiful sound.

          Bmar23z

          Year: 2015 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Afternoon

          April 02, 2019

          LOUD!!

          I knew this going in, so I was not surprised about how crazy loud this axle back is. The install was simple and I followed the videos online. Max of 2hrs on jack stands. Only I small issue, the Flowmater logo on the drivers side pipe was not centered on the tip. It's not bad, but I know its there, so it bugs me. Other than that, the quality was great.

          sims160

          Year: 2016 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          March 25, 2019

          Flowmaster outlaw axle back

          Sounds great and coupled with the Flowmaster scavenger x pipe is awesome!!

          ToddF

          Year: 2017 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          March 07, 2019

          holy loud

          got the outlaws with the scavenger x pipe has a nice deep purr to it, but shes very loud, might take getting used to

          MikeW

          Year: 2015 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          March 05, 2019

          Itssss alive !!!

          I have used flowmasters on every mustang i have owned. Absolutely love them. Deep tone Definitely a head turner. Easy to install. Looks amazing. And gets the blood flowing

          BrianS

          Year: 2016 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          February 21, 2019

          Works well and is easy to set-up.

          These mufflers have a nice deep sound. Solid construction with good welds.

          ChrstopherV

          Year: 2017 Submodel: GT

          Helpful (1)

        • 5/5

          February 03, 2019

          In love

          The product is great. They came on time. Was easy to install, and sound great.

          CalvinS

          Year: 2017 Submodel: GT

          Helpful (2)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: 0-$100

          February 03, 2019

          great buy

          the install added much needed grunt to the cars soft stock exhaust note. the sound only got better with a tune and X piles in stalled later very satisfied. I often get complements randomly at stop lights as I down shift to a stop....

          COBRA429

          Year: 2017 Submodel: GT

          Helpful (1)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: 0-$100

          February 03, 2019

          This is the way it's supposed to sound

          I had these installed with the rest of the exhaust still factory on my 2017 GT California special. It took the shop about 30 mins to install. I have not got the talked about 2k rpm drone, as a matter of fact the noise in the cabin is minimal you can still have a normal conversation but the sound outside is amazing. I have had nothing but compliments. Thanks American Muscle.

          Lloyd

          Year: 2017 Submodel: GT

          Helpful (1)

        • 5/5

          Installation Time: Less than 1 Hour

          January 20, 2019

          Great!!!

          This was a quick and easy install. The volume is perfect, it has a loud sound but still has a nice deep tone to it.

          Colton

          Year: 2015 Submodel: GT

          Helpful (2)

        • 5/5

          Installation Time: Less than 1 Hour

          January 05, 2019

          Insane

          This is perfect for thos who want a mean exhaust Sound and loud

          PeterG

          Year: 2015 Submodel: GT

          Helpful (2)

        • 4/5

          Installation Time: Afternoon

          December 26, 2018

          Sounds good

          I recently put this axle back on my car and left the rest of the exhaust stock. It sounds good, I definitely wouldn't say it's too loud as I actually plan on putting an x-pipe on soon to enhance it a bit. Overall a good sound especially considering it only replaces the mufflers.

          Kyle

          Year: 2016 Submodel: GT

          Helpful (2)

        • 5/5

          Installation Time: Less than 1 Hour

          October 19, 2018

          WOW!!! (Use the Scavenger X-Pipe also LOL!!!

          So....Disclaimer, most of what I say and compare in my review will be based on 2011 GT w/Corsa Perfomance exhaust Vs. my current 17 GT w/Flowmaster. On to what my thoughts are......YOU CAN NOT GO WRONG WITH THESE!!!!! These are truly amazing, I was worried about what I was going to get or end up with but, truly a bang for the buck! It is a different note and overall sound to my 11 GT, and I truly appreciate that it is different. I have heard the Corsa system on the s550's and that is what I was going to save for because I had such a great experience with my s197, but man I tell you that these Flowmaster satisfy my inner child and my man child LOL. Time will tell, but I don't have a reason at this moment to dig more money out of my pocket or save my money for another or more expensive system. I wish I could put a sound clip on here, but WOW WOW WOW for the $419 I have 0 regrets or doubts. I can not speak to what the performance difference between this axle-back, and other axle-backs without actually using them and doing an actual performance test. I can say that my 17 s550 sounds and runs great. Install - About an hour on a lift, I literally took the OEM exhaust off starting with the resonator straight back, one large section, and then installed the Scavenger X-Pipe (I ended up liking the factory clamps at the front of the resonator better than the was supplied with the X-Pipe.), I then installed the DS and PS axle-backs made a couple of adjustments to make sure they exited equal distance, and VOILA! done. At worse I would add 30 minutes if I was using just a jack system, and if your undercarriage has seen any heavy rain or grime. Thank you AM for having such a great variety, and for always making information available for the different products, and thank you FLOWMASTER for great great products!!! Again, I am not hating on other systems, I have used several on my different stangs. - Corsa, FLOWMASTER, Magna, ROUSH, Borla, etc..... ***Disclaimer I am using this axle-back setup along with the Flowmaster Scavenger X-Pipe. Together it was under $700.00. Install was about an hour (I used a lift).***

          Taino5oh

          Year: 2017 Submodel: GT

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          September 23, 2018

          Great exhaust !

          This exhaust is perfect if you want something loud that roars real deep ! I love it and’ so do all my friends , everyone will want to hear you rev ! You’ll be one of the loudest in your group ! If you have an x pipe of course !

          GerardoG

          Year: 2017 Submodel: GT

          Helpful (6)

        • 4/5

          September 17, 2018

          2016 5.0

          A little too loud. Not good for highway driving. Excellent in town for drowning out the sound of charger/challengers.

          MichaelC

          Year: 2016 Submodel: GT

          Helpful (6)

        • 5/5

          Installation Time: Afternoon

          September 15, 2018

          A thunderous explosion of Awesome

          Love it! Sounds like god Is breathing heavy while your revving down. Trying to keep it quiet early in the morning is not an option. Taking off from a stand still will make your neighbors think a plane has landed in there front yard .. seriously an awesome symphony of exhaust ecstasy

          StevenD

          Year: 2017 Submodel: GT

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          September 07, 2018

          Great sound, Great price

          The muffler alone is a great choice if you are looking to get a deep sound, however I strongly recommend pairing this with an x pipe as it will make the car SO Much louder.

          ErickM

          Year: 2016 Submodel: GT

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          July 12, 2018

          Are the neighbors up yet...?

          This exhaust was probably the best choice for me. If you are looking for noise and head turns this is the one. Very simple to install.

          AustinP

          Year: 2017 Submodel: GT

          Helpful (7)

        • 5/5

          Installation Time: Afternoon

          June 08, 2018

          A for Awesome!

          Look and sound amazing! If you want loud then this is it! Paired with th H pipe and I’m in love! Install was very easy with jack stands

          DavidL

          Year: 2015 Submodel: GT

          Helpful (7)

        • 5/5

          Installation Time: Less than 1 Hour

          June 06, 2018

          A huge change in sound!!!!

          I got these yesterday and had them installed and it woke up the quiet sounding stock mustang into a aggressive sounding head turning monster I absolutely love them!

          William

          Year: 2017 Submodel: GT

          Helpful (6)

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