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Flowmaster Outlaw Axle-Back Exhaust w/ Polished Tips (18-19 GT w/o Active Exhaust)

Market Price $666.99 You Save 12% ($77.04)
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$589.95 (each)

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  • Item 404840-A

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    Features & Details

    • Powerful Outlaw Series Axle-Back Exhaust
    • Offers a Raspy, Muscular Sound
    • Two Flowmaster Outlaw Mufflers
    • 3.50-Inch Mandrel-Bent Tubing
    • Durable Stainless Steel Build
    • Two Hardcore Polished Tips
    • Moderate Skills Required for Installation
    • Limited Lifetime Warranty
    • Fits All 2018-2019 Ford Mustang GTs without Active Exhausts
    Hostile Sound. Your 2018-2019 Ford Mustang GT was created to intimidate, so make sure it does just that by replacing its boring stock exhaust with Flowmaster's Outlaw Series Axle-Back Exhaust with Polished Tips. Designed to be used at race tracks that require mufflers, but don't have dB restrictions, this exhaust offers a raspy, muscular sound that will easily turn heads.

    Unbeatable Performance. Thanks to its superior design, this Outlaw Series Axle-Back Exhaust manages to produce more power than open headers, so your Pony boasts a dramatically improved performance. With increases in both horsepower and torque, this exhaust ensures your Pony maintains its spot at the front of the pack whether you're on the street or the track.

    Powerful Build. In order to ensure this Outlaw Series Axle-Back Exhaust is tough enough to remain reliable for a long time to come, it is created from 3.50-inch, mandrel-bent stainless steel tubing. The exhaust also comes with 2 hardcore, yet sleek and stylish polished tips that are guaranteed to turn heads wherever you go, while the included mufflers are one of the smallest and lightest race mufflers to date.

    Installation. In just 1 hour, you'll be able to easily secure this exhaust. However, moderate mechanical skills are recommended for the installation.

    Warranty. Featuring a limited lifetime warranty, this exhaust is protected against defects. Some limitations apply, so check out the full warranty for details.

    Application. Flowmaster's Outlaw Series Axle-Back Exhaust with Polished Tips fits all 2018-2019 Ford Mustang GTs without Active Exhausts.

    Fitment: 2018 2019 Details

    MPN# 817821

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Driver Side Muffler Assembly
    • (1) Passenger Side Muffler Assembly
    Installation Info
    Will it fit my Mustang?

      Customer Photos (4) Submit Your Photo

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        Questions & Answers (1)

        1 Top Rated Question

        Bought this flowmaster exhaust months ago and finally had the time to install it. Sounds great the rumble is fantastic! It's almost borderline too loud, but refrains from crossing over that line. I did notice however, that my rpms were running lower than normal - about 1000rpms lower than with the stock exhaust, and that I had to press the accelerator down farther to rev it to the same rpm I would have gotten it to with the stock exhaust. I've never seen anything like this before. Is this normal?

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          Customer Reviews (8) Write a Review

          Overall Rating 5

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:0-$100

          • Loudness / Volume 4.75 4.8
          • Exhaust Note 5 5
          • Fit & Finish 5 5
          • Bang For Your Buck 4.875 4.9

          • 5/5

            Installation Time: Less than 1 Hour

            June 29, 2019


            It was way louder then I expected, especially paired up and an X pipe. No regrets!


            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            June 10, 2019

            Amazing sound

            I purchased this exhaust to meet my goal of a loud and deep race car growl without there being too much drone inside the cabin. To say the least, this exceeded my expectations. I left the resonator on the car to prevent in-cabin drone, and yet this thing still crackles and pops and is still LOUD. It is the absolute perfect sound and the neighbors aren't too upset about it surprisingly. Now take off that resonator and the drone inside the car will be awful (I have a friend who did that and you cannot talk to one another) but with the X pipe there would definitely be more popping if that is what you are looking for. Install was quick, I took it to a local professional muffler shop, they charged 80$. So if you want a deep growl and bite added to your mustang, this is the right purchase!


            Year: 2018 Submodel: GT

            Helpful (1)

          • 5/5

            April 12, 2019

            This is by far the best exhaust!

            I thought this would be too loud, but after pairing it with the Scavenger X Pipe, it is exactly how the coyote should sound. I don’t think it’s too loud, but I ran the car on just the X Pipe, before I received my axle backs. Now that is loud! You won’t be disappointed with this exhaust. Plus the price is the best bang for your buck!


            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            February 10, 2019

            AMAZING Deep Rumble

            I don't often leave reviews but man do these sound incredible. I wanted my 18' GT to sound tougher but not raspy. I bundled this with a H-Pipe in place of the old resonator. Don't get me wrong, this is LOUD! But, in an old muscle car kind of way. I constantly get compliments on the way it sounds. There is some highway drone around 2000RPM but a small price to pay for this quality exhaust note. By the way, this is my daily driver and after a couple weeks of driving I hardly notice the drone at all anymore.


            Year: 2018 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            January 03, 2019

            Great sound

            Pretty simple to install, the tips look great and sounds amazing.


            Year: 2005 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            January 03, 2019

            Outlaw axleback

            This axle back sounds amazing, i really like the deeper tone it provides over the other high pitched tinny sounding ones, it gets real good above 4000 rpm, i do recommend installing an xpipe, it really compliments the sound


            Year: 2018 Submodel: GT

            Helpful (5)

          • 5/5

            October 25, 2018

            Smiles per gallon

            Took 1 hr total to tear down and put in Outlaw axle backs AND scavenger x pipe. Just leave the clamps loose till your ready to commit to fitment. Then tighten. The "hardest" part was getting the tips just right and identical on both sides. Pretty standard stuff if you ever installed a catback before. No cutting what so ever WHEN paired with the scavenger axle back. Complete bolt on. I love the small "mufflers" (and i use "mufflers" loosely) they have just enough to change it from that raunchy, nasty typical straight pipe design you might see elsewhere which IMO usually sounds terrible. The kit is an unbelievable deal on price point, product quality, fitment and true hostile, aggressive, signature baritone flowmaster sound with some cracks and pops thrown in.


            Year: 2018 Submodel: GT

            Helpful (11)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            October 18, 2018


            I installed this exhaust on my 2018 5.0. You would not believe. This exhaust sounds GREAT. Surprise me that it had very little moan inside the car unless you got on it. The finished tips look much better than I expected and I like the word flow master engraved on the top of each tip. Beautiful. Didn't see it necessary to purchase the cat back but if you purchase this exhaust and the X pipe you will need to cut a piece of the original exhaust pipe to get the length and the little bend to connect the two No problem. Great buy and sound. You WILL love it


            Year: 2018 Submodel: GT

            Helpful (10)

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