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

Market Price $499.99 You Save 16% ($80.00)
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$419.99

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  • Item 389966
  • MPN# 817732

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    Features, Video & 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

    Review & Installation Video

    Review & Install Video

    Hey everyone, I'm Justin with americanmuscle.com. I'm going to be taking a closer look at the Flowmaster Outlaw series axle-back available for your 2015 GT Mustang. Flowmaster is, without a doubt, one of the most recognizable names in the world of Mustang and muscle car exhaust in general. In fact, we used several different Flowmaster systems on some of our past project car builds, including project Terminator. If you guys haven't seen these builds yet, what are you waiting for? Be sure to subscribe to our YouTube channel American Muscle Videos for the best Mustang specific content and product overviews available on the web. If you happen to be looking for one of the most aggressive axle-backs available for your Coyote powered S550, well then look no further than the Flowmaster Outlaw series. As you can see, this particular system does feature Flowmaster's patented Outlaw series mufflers which are the smallest and lightest muffler they offer and was originally designed for circle track applications where strict decibel sound limits had to be met with open header cars. As a result, Flowmaster designed those Outlaw series mufflers to be a straight-through free flowing design muffler, if you can really call it that, that will still offer plenty of sound. Picking up this system, I can tell you it is one of thr lighter systems I felt for the 2015 Mustangs. A lot of that can be attributed to those Outlaw series mufflers I just talked about in addition to the 409 grade stainless steel construction throughout. Finally, looking at the four inch polished tips here embossed with that iconic Flowmaster logo that will really help set off the rear of the car. If you guys aren't satisfied with this video and you want to see more detailed info on this exhaust, including more pictures and install tips, well then click on the link below to head back to our product page at americanmuscle.com if you're not there already. Speaking of install tips, since this is an axle-back you will need to do some small cutting as is the case with most 2015 axle-backs. Don't worry, it's really not a big deal at all as long as you take your time and follow the detailed instructions included with the particular exhaust. Either way, guys, if you do have any questions about the exhaust itself or about the actual install, feel free to reach out to a Mustang expert any time using our 1-800 number. They're always standing by ready to help out a fellow Mustang owner in need. Now it's time to hear how the Flowmaster Outlaw series axle-back sounds compared to our factory exhaust.

    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

    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?

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    26 Questions / 5 Answers

    Ask a Question

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

    TheBear96

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

      Rob D

    Helpful (2)

    Will this fit any resonator delete x pipe

    Red

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

      pserafi

    Helpful (1)

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

    VinceA

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

    laythj

    • 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.

      AMRobD

    Helpful (0)

    Will this clamp up to the sr x-pipe?

    JoshF

    • Installing this Flowmaster Outlaw Series Axle-Back Exhaust will require cutting and removing the factory muffler assemblies and clamping these in their place.

      AMKarinA

    Helpful (0)

    Does the addition of this exhaust increase HP? Even slightly?

    DylanH

    • This Flowmaster Outlaw Series Axle-Back Exhaust is not rated for an increase in horsepower, however, it will aid in decreasing exhaust back pressure which will allow the engine to breathe better and perform more efficiently.

      AMJEFF

    Helpful (0)

    People Who Bought This Item Also Bought

    Customer Reviews (100+) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Loudness / Volume 4.8 4.8
    • Exhaust Note 4.858537 4.9
    • Fit & Finish 4.663414 4.7
    • Bang For Your Buck 4.829268 4.8



    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      May 21, 2018

      Amazing

      Bought these and had a collision shop behind my job do the install, due to me not having the tools at home. I read through other reviews that said these were very loud when combined with a resonator delete, but the axle backs alone make a world of difference. Turns heads everywhere I go, even in the low RPM's. 100 worth the cost and I'll be looking at Flowmaster for the X-pipe when I decide to put that in as well!

      MattC

      Year: 2016 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      May 16, 2018

      Great!!

      Cant beat this sound for the price! Definitely a good item to buy

      GabrielR

      Year: 2016 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      May 08, 2018

      Awesome

      Absolutely the Best axle back you can get. Throwing an h pipe on this week. Without it it’s perfectly loud and deep, but I want this bad boy to scream haha no drone. Just sounds awesome

      MichaelR

      Year: 2017 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      May 06, 2018

      Love them!!

      Loud but not to much drone! Needed to add some pipe to fit but simple and well worth it.

      JacobL

      Year: 2016 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      April 29, 2018

      Hands down the best

      I paired the Outlaw with the Scavenger Series X Pipe and the results were amazing. Let me just say that it is LOUD, and one of the most aggressive axel backs that I have ever heard. If you are looking for something insanely aggressive and loud, the Outlaw is the choice. The Outlaw is notorious for a big drone at around 2K RPM though but it doesn’t bother me one bit. Couldn’t be happier.

      BrandonE

      Year: 2015 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 23, 2018

      Bent tip

      The sound is awesome, but by the time my package arrived the tip had been bent really bad and the other side looked like it had road rash. I contacted american muscle and nothing has been done.

      RachelP

      Year: 2017 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      April 19, 2018

      Awesome Sound

      Four days after purchasing my '17 GT, I installed the Ford Performance quad exhaust without the baffle so the side pipes were very loud on hard accleration. I decided I wanted more sound and after reading the reviews, went for the outlaw series. My mechanic thinks I'm crazy but I'm very happy. The sound is throaty and loud, just what I wanted. It does have some droaning at 1500 to 2,000 rpm but I only hit that rpm on my way up so it doesn't bother me at all. With the windows up at regular speeds on the freeway, the cabin has a little noice but a good noise. Still can carry on conversations and hear the radio. Very happy with my purchase.

      JayS

      Year: 2017 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      April 16, 2018

      Wake the neighbors loud with a god like purr

      Have the savage X pipe so the install was around 30 only jacked up 1 side . Slipped right on and the 1st cold start was sooo sexy I think it took 2 days for my smile to fade. Could be considered a bit loud at 6 am. I haven’t had any complaints from any neighbors just alot of complements on how old school it sounds. When you do the “woot I’m under a bridge, lets see how loud I can be” you will turn heads for blocks . If you like to be looked at while out and about, this exhaust is for you.

      DannR

      Year: 2016 Submodel: GT

      Helpful (0)

    • 4/5

      Installation Time: Afternoon

      April 13, 2018

      Flowmaster outlaws

      The product sounds AMAZING! If you’re not looking for loud then don’t get this! They’ll make your neighbors mad. But they sound great, have a nice growl. But of a drone around 2k but goes away. Gave it a 4 because the passenger side would not line up at all so (and I’m a tech for a dealership) and had to take it to an exhaust shop to have it sucked in so the tips wouldn’t stick out and have them line it up to get the right side in. I have it paired with an sr performance xpipe. Other than that they’re great and look great!

      Aaryn293

      Year: 2017 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      April 12, 2018

      outlaw

      wow,it's 2 loud i got longtube headers and custom x pipe the sound is amazing,

      laythj

      Year: 2016 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      April 09, 2018

      Badass

      Awesome sound. Easy install. My pony gets alot more looks now with these pipes.

      TraceyW

      Year: 2017 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      April 03, 2018

      Awesome Sound!!!

      I purchased the axle back Flowmaster Outlaws along with the Flowmaster Scavenger Series X-Pipe resonator delete for my 2017 Mustang GT with the performance pack and just had them installed today. My mechanic said the install was very simple and I had my car back in about 2 hours.THIS IS WHAT A MUSTANG SHOULD SOUND LIKE FROM THE START!! I can't understand why Ford even puts a resonator on the Mustang GT. I absolutely LOVE the aggressive growl the car has now with the new Flowmaster exhaust. I was worried about the cabin noise after reading several reviews but haven't noticed a huge difference inside the vehicle. At least not enough to complain about. Outside the vehicle is another story though...lol! It turns heads everywhere it goes now. Thanks American Muscle for having such great products. I have never been disappointed with anything I've purchased.

      MelissaB

      Year: 2017 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      March 30, 2018

      Flow master Outlaw Exhaust

      This was my first mod to my 2017 Mustang GT. Very loud and a joy around town. If you coast by the cops you should be fine. Cold start ups are amazing! Only issue is that there is a decent amount of drone around 1800-1900 RPMs on the highway. Pretty loud in the car. Cruise control cleans it up but who wants to do that? Fit and finish is great with chrome tips. 4 stars because of the drone. I would buy these again if I had to start over.

      NEstang

      Year: 2017 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      March 23, 2018

      Classic sound!

      I love the way the Flowmasters sound on my S550. Don’t hesitate to get the X pipe! The neighbors need to learn to love it too. Best purchase I’ve made all year!!

      TroyM

      Year: 2015 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      March 21, 2018

      LOUD and Lovely

      I can't say enough about these "mufflers". The sound is pure happiness.

      BryonP

      Year: 2017 Submodel: GT

      Helpful (0)

    • 4/5

      Installation Time: Less than 1 Hour

      March 13, 2018

      Wow it's loud

      Very easy install. Fits really well. Didn't realize how loud it was going to be. Defiantly something you will need to be careful about alerting the police.

      EricH

      Year: 2017 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      March 08, 2018

      Sounds amaing

      I paired the flowmaster outlaw with the scavenger X pipe and it sounds really aggressive!!

      DavidJ

      Year: 2017 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      February 28, 2018

      Well worth it

      I paired this with the sr performance x pipe, and just had to cut a 1 foot section of pipe to make the bridge from the exhaust to it. Has a deep rumble at idle, and it screams at 3500 rpm. Doesn't affect my radio listening. Drone is mild but it makes you feel like you're in a racecar instead of a prius. Well worth the money I paid.

      JimmyA

      Year: 2017 Submodel: GT

      Helpful (3)

    • 4/5

      February 28, 2018

      L O U D !

      I installed these with an X-Pipe resonator delete. When I tell you I shopped and Shopped and did my homework before making a purchase, took me forever to pull the trigger. I could not be more pleased! On the 1st cold start I was smiling from ear to ear, I knew I made the right buy. Outlaws paired with SR performance X-Pipe is the way to go. Besides about 6 inches of pipe, you’ll end up with a cat back system when you pair these 2. Videos don’t do justice to what this really sounds like. I left for work at 430am, my neighbor called me and told me h didn’t mind waking up to that sound... Just buy them, you’ll be happy

      Smoked550

      Year: 2017 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      February 02, 2018

      Hear the power

      Add emotion to your stang with this bang for the buck exhaust!

      Atenogenes

      Year: 2017 Submodel: GT

      Helpful (2)

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