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Flowmaster Outlaw Axle-Back Exhaust (11-12 GT, GT500)

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Market Price $520.99 You Save 12% ($61.04)
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$459.95

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  • Item 18422

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    Features, Video & Details

    • Super Aggressive Flowmaster Outlaw Sound
    • Durable 409 Stainless Steel Construction
    • 2.75" Mandrel-Bent Tubing
    • 4" Polished Stainless Steel Tips
    • Includes Two Flowmaster Outlaw Mufflers
    • Fits 2011-2012 GT, Boss and 11-12 Shelby GT500

    Review & Installation Video

    Review & Install Video

    Hi I’m Justin with AmericanMuscle.com, and I’m taking a look at Flowmaster’s outlaw series axle back for your 2011 and up Mustang GT. The outlaw series is Flowmaster’s most aggressive system thanks in part to the straight through, race oriented style mufflers. The result, a super aggressive tone that’s sure to get you noticed. The system is constructed from durable 2 and 3 quarter inch 16-gauge steel, leading straight through these outlaw style mufflers. The cheery on top are these 4 inch polished tips, embellished with a Flowmaster logo. A simple bolt on installation here guys, should take you no more than an hour. Let’s hear how Flowmaster’s outlaw style axle back measure up to the stock exhaust.

    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 2011-2012 GT, Boss and the 2011-2012 Shelby GT500 Mustangs for both great looks and great sound.

    Fitment: 2011 2012 Details

    MPN# 817516

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

    What's in the Box
    • (2) Muffler assemblies
    • (2) 3/8" Hanger Keepers
    Installation Info
    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-through Fitment: 2011-2012 GT, Boss and Shelby GT500
    Will it fit my Mustang?

      Customer Photos (27) Submit Your Photo

      View All 27 Photos

        Questions & Answers (21)

        5 Top Rated Questions

        I live in California and I drive a 2013 Boss 302. I'm wondering if this Exhaust system will keep up with the new sound regulations?

        • None of our exhausts currently have the decibel levels so it is unknown if they are in compliance.

        Helpful (1)

        I’m seriously interested in installing this on my 2011 gt, ragtop. It would be the 1st mod done. Will this require any tuning, or is this simply a drop n swap?

        • The Flowmaster Outlaw Axle-Back Exhaust is a completely bolt-on exhaust system. This exhaust does not require a tune or additional modification for a complete installation. 

        Helpful (1)

        HI, I LIVE IN MEXICO, AND WISH TO ORDER THESE, BUT NEED TO KNOW THE FOLLOWING INFO.. SO THAT I CAN CALCULATE SHIPPING WEIGHT OF THE PACKAGE LENGHT OF THE PACKAGE HEIGHT OF THE PACKAGE WIDTH OF THE PACKAGE I WOULD REALLY APPRECIATE YOUR HELP.

        • These will weight roughly 24lbs and will be roughly 35.33 X 14.67 X 15 in size.

        Helpful (1)

        What is the difference between these and the 13-14 model. Would the 13-14 not fit a 2012 Boss

        • The rear lower valance on the 2013-2014 models is different from that on the 2011-2012 model Mustangs. These are specific for the 2011-2012 model Mustang rear end.

        Helpful (1)

        How far does the tips extend out the rear of the car? I was wondering how far does the tips extend out the rear of the car compared to stock?

        • Not much at all it's perfect

        Helpful (1) Show 1 more answer
        Post Your Question
        10 More Questions
        Is there any way to lessen the exhaust drone at around the 2k RPM mark when its really bad on the highway?? Currently running straight pipes w/ cats and factory headers. 1 answer
        Is there a way to change the tips for 4.5 inch tips? 1 answer
        Would this exhaust be too loud for a convertible? 1 answer
        If I get the pypes true dual conversion for my 2010 V6, will this axel-back fit? 1 answer
        Will this fit on a 2011 V6? 1 answer
        If I get the right pipes on my 2010 mustang will I beable to just put this exhaust right on? 1 answer
        do you have to make computer adjustments after installation 2 answers
        Any HP gains? Are there any noticeable HP gains? And will I benefit from a retune after installation? 2 answers
        Which axle back muffler system is louder the flowmaster outlaw series or the heartthrob muffler delete system for 2012 Mustang GT ? 2 answers
        Compatible w/ Magnaflow Comp Cat-Back? I currently have the Magnaflow Competition Cat-Back system installed on my 2012 GT. I've been looking at the muffler delete axle backs; but, something about these Flowmasters grabbed my attention. They just sound like the perfect amount of "old school" rumble and seem to make the 5.0s growl. My questions are: will these bolt up to the Magnaflow pipes? And, are they something I should really consider--the (Flowmasters) appear to be more "muffler delete" than what the Magnaflow mufflers have, will it give me a more aggressive/old school sound? Or will I be out $400 without changing my exhaust sound.... 1 answer

          Customer Reviews (100+) Write a Review

          Overall Rating 4.8

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:0-$100

          • Loudness / Volume 4.865854 4.9
          • Exhaust Note 4.884146 4.9
          • Fit & Finish 4.658536 4.7
          • Bang For Your Buck 4.817073 4.8



          • 4/5

            Installation Time: Less than 1 Hour

            March 26, 2019

            Sound good.

            Honestly I feel my Roush axle backs are louder then these. But the Roushs were starting to split at the welds so wanted something louder but doesn’t sound like it. Sounds good but not the same bark as the Roush ones at full throttle. Still have stock exhaust from axle forward so on to those next!

            Ben

            Year: 2012 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            March 22, 2019

            Flowmaster Outlaw

            This is exactly how your V8 should sound, this exhaust is exactly what I wanted. The install took me around 2 hours with only a jack, jack stands and hand tools, if I can do it alone, anyone can do it.

            ChrisL

            Year: 2011 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            January 21, 2019

            Love it

            It’s very loud and has an amazing tone, people always ask me what I did to it!

            JaydenF

            Year: 2012 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Less than 1 Hour

            December 28, 2018

            Bang For Your Buck

            This exhaust is one of the loudest ones you can get for the GT. Has a nice mean growl and you will def break some necks in the process. It only gets better when you have a intake. Anyone can do it, don’t take it to a shop, just need an jack, simple hand tools, and some lube.

            BigMack

            Year: 2012 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            December 11, 2018

            That roar you've been looking for

            Amazing exhaust note, just a really loud cabin drone around 2k rpms, either get used to it, break it in, or get sound proofing.

            CookieMonster

            Year: 2011 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            October 31, 2018

            Loud and Proud

            Had my outlaws installed on Saturday and absolutely love them! Deep and mean growl at idle... smash the gas and you better buckle up buttercup. If you want to turn heads, look no further. Highly recommended.

            RobbI

            Year: 2011 Submodel: GT500

            Helpful (9)

          • 5/5

            Installation Time: Less than 1 Hour

            September 28, 2018

            Aggressive Sound

            The Outlaws have a great sound. If your exhaust is all stock and you want some extra aggressive sound, this is a good choice. It sounds great under light acceleration and at idle but it is loud when you step on it. Definitely makes it sound more like a mustang.

            Don

            Year: 2003 Submodel: Mach 1

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            September 15, 2018

            Flowmaster Outlaw series mufflers

            I had them installed on my 2012 GT 5.0 and now the engine growls and roars. I wanted loud mufflers not sure which ones to go with, I am glad I went with the Outlaws. I love reving the engine when stopped at a red light.

            Joseph

            Year: 2012 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Less than 1 Hour

            August 29, 2018

            Outlaws

            Easy install and they sound great. Just need a few hand tools and some spare time.

            RamonR

            Year: 2011 Submodel: GT

            Helpful (8)

          • 5/5

            August 09, 2018

            Beautiful Rumble

            I love the sound of this exhaust. Loud and proud. What suprised me was several older guys said they really liked the sound. It does have a drone around 2000 RPMS which doesn't bother me. I have a convertible and it is music to my ears.

            WesF

            Year: 2012 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            August 04, 2018

            Flowmaster!!!

            Perfect combination of loud, deep and raspy put together! City driving sounds amazing, the idle is deep and smooth, smash the gas pedal and this thing really come see to life! If you like loud you really can’t go wrong with these I promise you.

            KennyB

            Year: 2012 Submodel: GT

            Helpful (9)

          • 5/5

            Installation Time: Less than 1 Hour

            August 04, 2018

            America

            This exhaust let's people know you are a true american. It transformed your mustang into a muscle car. It has a very deep tone to it and sounds great. Combined with an H pipe and it sounds amazing. I would recommend to anyone who wants a loud and deep exhaust

            Dalton

            Year: 2012 Submodel: GT

            Helpful (8)

          • 5/5

            July 20, 2018

            The way a Mustang should really sound!

            The Flowmaster Outlaws are the correct axle back mufflers for your Mustang if you like muscle car sound. Rowing through the gears makes people snap their heads to hear the power of the V8. Bring back memories of me like rolling in my first 5.0 in 1990 with 2 chamber flowmasters Get these Outlaws. You won’t stop smiling.

            AndrewM

            Year: 2011 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Less than 1 Hour

            June 22, 2018

            Bad to the bone!

            These axle backs are so impressive it’s more than I expected! The sound and the tone these produce are amazing and don’t hold back to pull the trigger on these outlaws!

            Junior

            Year: 2011 Submodel: GT

            Helpful (9)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            May 28, 2018

            Bada**

            I’ve got my flowmaster outlaws paired with bbk long tube headers and a bbk off-road x-pipe and it is insanely loud and has a great tone. Sounds like a dragcar when you get on it and I love it!

            MattR

            Year: 2011 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Less than 1 Hour

            May 12, 2018

            The love of my car life.

            These exhaust are the best on the market. The coyote engine sounded like a quiet person at the library with the stock mufflers. Now with the Flowmaster Outlaws on my Mustang the coyote does more than howling it growls and roars.

            SladeOutlaw

            Year: 2012 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Less than 1 Hour

            May 12, 2018

            Love it!

            The axle back itself was a easy install only reason it took so long for me and my dad was the cat delete pipes but those with a x pipe and outlaws my car is easily the loudest car on base (military) some might think it’s too loud but they are outlaws for a reason ;)

            CameronT

            Year: 2012 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Less than 1 Hour

            May 10, 2018

            Epic

            These are loud and very aggressive. You are definitely going to bring attention to yourself but the second are worth it if that's what your looking for.the install was also really easy it took me 45 minutes to complete.

            ReginaldS

            Year: 2012 Submodel: GT

            Helpful (10)

          • 5/5

            May 10, 2018

            AWESOME!!!!!

            Love the Flowmaster Outlaws!!!!! Definitely recommend for anybody with a GT.

            NathanaelA

            Year: 2011 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Less than 1 Hour

            May 04, 2018

            Sounds amazing!

            Mufflers were very well packaged with extra protection on the tips also shipping was spot on as for the mufflers I had a resonator delete done just before I installed them and the sound quality is above and beyond what I thought it would be! Worth every dollar

            BrianM

            Year: 2012 Submodel: GT

            Helpful (10)

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