Free Shipping On Orders Over $49. Details

Talk to a Mustang Expert
1-877-887-1105
Mon - Sun, 8:30 AM EST - 11:00 PM EST
Win 1 of 2 $15,000 Mustang Builds! Enter To Win!

Flowmaster Outlaw Series Axle-Back Exhaust (05-10 GT, GT500)

Market Price $516.99 You Save 12% ($59.51)
Starting At

$457.48

FREE Shipping
  • Item 18423
  • MPN# 817511

Local Install Shops

Quoted installation from $125

View 3 Shops

near 19355 (change)

Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.

Will this fit your Mustang?

In Stock Ships same business day.
Ship to: ASHBURN - 20146
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features, Video & Details

    • Super Aggressive Flowmaster Outlaw Sound
    • Durable 409 Stainless Steel Construction
    • 2.5" Mandrel-Bent Tubing
    • 4" Polished Stainless Steel Tips
    • Includes Two Flowmaster Outlaw Mufflers
    • Fits 2005-2010 GT, Bullitt, and Shelby GT500

    Review & Installation Video

    Review & Install Video

    Hey everyone I’m Justin with AmericanMuscle.com, and today we’re going to be breaking down the Outlaw series Axle-back from Flowmaster for the 2005-2010 Mustang GT. Flowmaster calls this their most aggressive Axle-back system available for the late model 46 Mustangs. This entire kit centers around these two outlaw series mufflers, which to the casual observer, hardly resemble mufflers at all, but rather highly engineered resonant tubes, which are responsible for that super aggressive tone. Like many other Flowmaster kits the Outlaw series features 409 grade steel construction and 2.5” mandrel bent tubing. It also features this very sleek black finish, which is going to be great at resisting corrosion. Everything exits out of these dual 4” polished tips, embossed with that classic Flowmaster logo. Installation of this Axle-back is very straight forward and should only take you about an hour using some basic hand tools. Now let’s hear how the Outlaw series from Flowmaster sounds compared to your factory exhaust.

    Super Aggressive Flowmaster Sound. Give your 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.

    Quality Construction. Constructed from durable 2.5" 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 2005 to 2010 GT, Bullitt and the 2007-2010 Shelby GT500 Mustangs for both great looks and great sound.

    Technical Note: Americanmuscle recommends adding the 2005+ Mustang 304 Stainless Steel Exhaust Hanger Kit from the drop down option above, to provide more strength, stability and a cleaner installed appearance. If you have a 2007 Mustang you may need the kit for correct installation.

    Fitment: 2005 2006 2007 2008 2009 2010 Details

    What's in the Box
    • (2) Muffler assemblies
    • (2) Clamps
    Installation Info
    Tech Specs
    Axle-Back Exhaust Specifications
    Piping Material: 409 Stainless Steel Tip Material : Polished Stainless Steel
    Piping Size: 2.5" Tip Size: 4.0"
    Muffler Type: Straight-through Fitment: 2005-2010 GT, Bullitt and Shelby GT500
    Will it fit my Mustang?

    You Might Also Like

    Customer Photos (77) Submit Your Photo

    View All 77 Photos

    More Products You Might Like

    41 Questions / 12 Answers

    Ask a Question

    SLPLOUNDMOUTH OR FLOWMASTER OUTLAWS DID HE HAVE A BIG DIFFERENCE BETTEWN THE SLP LOUNDMOUTH AND THE OUTLAW. THE FLOWMASTER OUTLAW IS IT REALLY LESS LOUND THAN SLP LOUNDMOUTH I HAVE A GT 2005, AND I REALLY DONT KNOW WITCH ONE BUY. WHICH ONE IS GONNA BE THE BEST FOR SOUND AND PERFORMANCE. WITCH PART I COULD JOIN TO THE OUTLAW FOR INCREASE SOUND AND PERFORMANCE THANKS

    echellon

    • Outlaw is plenty loud all by itself. If you want to amp it up try some long tube headers paired with an h pipe. But trust me they're good all by themselves

      Cableguy500

    Show 3 more answers Helpful (9)

    How do these sound on a V6 with true dual? Do you have a sound clip available?? I removed the X brand because of cabin drone... will these create a drone on the V6? Thanks

    UncleJ

    • I have sound clips of a 2009 V6 with the ford racing dual exhaust that uses a true dual setup and the same mufflers as the bullett mustang, and the Flowmaster Outlaw. The Outlaw provides a much deeper throat tone to the exhaust making it more like a V8 sound. It has a little bit of drone at certain RPM's however it really gives the V6 a muscle car sound. The closest thing I can relate it to is the new Boss 302 Laguna Seca. IT SOUNDS AWESOME!!!!

      luftwaffer

    Show 2 more answers Helpful (5)

    I have the Pypes muffler deletes on my 05. Are these Flowmaster Outlaw axle back louder and have a deeper sound than the Pypes muffler delete's? Cant really hear the difference between the video's

    PATRICK95GT

    • The Pypes Muffler-Delete Axle-Back Exhaust (05-10 GT, GT500), item # 20022, (http://www.americanmuscle.com/pypes-2005-gt-muffler-delete-axel-back.html) may have a slightly higher pitched sound than the Flowmaster Outlaw Series Axle-Back Exhaust, The Flowmaster's are going to have a very deep sound that is also loud. It also depends on what other exhaust mods you have made. Different headers and mid pipe will drastically change the sound of the car as well.

      AshleyK

    Helpful (1)

    Do the Flowmaster Outlaw series Axle-Back Exhaust add horse power to your Mustang.

    2Mac

    • That is a big yes and they sound real good and meaty.

      RonN

    Show 2 more answers Helpful (1)

    Will these get me pulled over for being too loud?

    Corey

    Will the Flowmaster Outlaw Exhaust pass Pennsylvania state inspection?

    Loudmouth

    • The Flowmaster Outlaw Series Axle-Back Exhaust will be legal in all states for inspection.

      Ricky36

    Helpful (0)

    People Who Bought This Item Also Bought

    Customer Reviews (100+) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:0-$100

    • Loudness / Volume 4.816199 4.8
    • Exhaust Note 4.869159 4.9
    • Fit & Finish 4.604362 4.6
    • Bang For Your Buck 4.7625 4.8



    • 5/5

      Installation Time: Afternoon

      May 11, 2018

      What a difference over factory’s stock mufflers

      This exhaust are definitely a head changer and are easy to install just a few awkward spots getting the hangers down but it was worth the hassled and them Polish give this aggressive exhaust a nice finish definitely would consider every mustang person to take a look at these!

      AdamR

      Year: 2007 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      May 03, 2018

      Fantastic Flowmasters

      I enjoy driving my GT500, but the factory exhaust really left me feeling like something was missing. After researching so many different manufacturers and parts options, I decided to buy the Flowmaster Outlaw Series Axle-Back exhaust. After all, it has great reviews, a superb reputation of quality, and the price was just right. A couple of days later, the mufflers arrived and with the excitement of a kid at Christmas, I tore open the box. I was not disappointed to say the least. The workmanship and quality put into this exhaust is evident in the materials used, expert welding, and even the black finish with shiny tips featuring the Flowmaster logo. It took me about an hour to pop off my factory exhaust, and install the Flowmaster Outlaws. The prewelded brackets fit easily and securely into my factory hangers... I was lucky enough to have an '07 with the right hangers, and not need to purchase new ones. So I tightened everything up, and fired up the engine. Let me say this.... even with factory cats, it was amazing. It was that perfect spot between not loud enough and too loud. The Flowmaster Outlaws are perfect for an aggressive but not overwhelming sound that every muscle car enthusiast loves to hear. Everything about this axle-back exhaust was great, from start to finish, and I am absolutely in love with it still after almost a month. 10/10 recommend if you want a head-turning, aggressive growl for your hot rod, the Flowmaster Outlaws are what you need.

      DannyB

      Year: 2007 Submodel: GT500

      Helpful (1)

    • 3/5

      Installation Time: Less than 1 Hour

      April 29, 2018

      Outlaws

      At 3,000rpm and above with longtube headers and a catless x-pipe you will shatter eardrums!!!! The fit isnt very good..does not fit into stock hangers on the car. But if you are looking for wide open design and quality these are for you

      08InfantryGT

      Year: 2008 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 25, 2018

      Best prouduct alive.

      Best exhaust pipes out right now. Turned my gt into a beast.

      ShawnL

      Year: 2006 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      April 20, 2018

      Omg love these!!

      Sound is amazing! Pretty loud for a v6! Nice and deep when combined with CAT delete and an X-Pipe or H-Pipe.

      Jordan

      Year: 2005 Submodel: V6

      Helpful (1)

    • 5/5

      April 14, 2018

      Lound and tunder

      Great exaust they sound so good really happy with theis product

      RomanF

      Year: 2010 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 11, 2018

      Freaking awesome !!

      Brought the car to life. Awesome deep throaty sound. Sounds amazing

      MichaelM

      Year: 2010 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      April 09, 2018

      Stormtrooper V6

      I got a 2007 mustang v6, with this product it sounds better then what most would think it would. The guys at the shop was amazed when they first started it up. The outlaws are a way to go with a v6 or a V8. My system is loider then my buddy's 2007 mustang GT with the borla ataks.

      DylanE

      Year: 2007 Submodel: V6

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 03, 2018

      Great Exhaust

      One of the best Exhaust I have had for that price is the best

      MathewK

      Year: 2006 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      March 25, 2018

      Flowmaster Outlaw

      This axle-back exhaust sounds absolutely fantastic! For just being an axle-back, it is very loud. If you are planning on adding x-pipes to this, be prepared for your neighbors to hate your car

      HunterW

      Year: 2009 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      March 24, 2018

      Great bang for your buck

      The outlaws are a bit on the expensive side but when you install them and start driving you will forget about the 500 bucks you just dropped and smile ear to ear. The stock gt exhaust is trash, everyone knows that. The outlaw system brings out a loud growl from your v8 with minimal droning at highway speeds and is an easy install with a proper lift. Very happy with this purchase.

      Jordan

      Year: 2010 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      March 19, 2018

      Simply the BEST!!!!

      Second time around with these Outlaws......a pair for my '06 and '07. Easy as Plug and Play. No better sound out there!!

      Broakie56

      Year: 2006 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      March 11, 2018

      Great Product

      Very loud and aggressive exhaust all around but very reasonable cruising. Also cold starts sound amazing

      ThomasL

      Year: 2010 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      March 09, 2018

      Great sound

      Third exhaust I purchased . This was the by far the best. Had jba too quiet. Had pypes muffler delete too loud and vibrate. Running x pipe with cats jba

      Saleena07

      Year: 2007 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      Installation Cost: 0-$100

      March 07, 2018

      great sound

      Easy to install. Sounds great. took a little over an hour. Love it!!

      ShanonD

      Year: 2007 Submodel: GT500

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      February 19, 2018

      Overall Great Purchase!

      Decided to go with these as they had great reviews. The sound when driving is perfect, although they weren't as loud as I was hoping. I had a shop install them and I have scraping on my bumper on the passenger side muffler. Can't tell for sure if it's the shop's fault or not but that is why I gave it a 4/5 for Fit and Finish. Cold starts are also very loud. :)

      TrevorR

      Year: 2008 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      February 16, 2018

      Just buy them!

      Absolutely love the outlaws. I Was nervous with how it would sound at first but now that they are installed its the perfect mustang sound.

      GordonJ

      Year: 2006 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      February 15, 2018

      Sounds Excellent

      Installed on my 2006 Mustang GT and I am very satisfied. I wanted a deep throaty sound. The tone is excellent. I can't stop driving it....i look for reasons to take off down the road lol....Gonna be a fun Summer. Now for the CAI install.

      MartinT

      Year: 2006 Submodel: GT

      Helpful (2)

    • 5/5

      February 14, 2018

      Loud

      I like the sound it took under an hour to install good parts i would say others should take a good look at these......,,,

      JohnO

      Year: 2005 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      February 08, 2018

      Great Sound and Easy Install

      Installed these along with Stainless Works 3" H-Pipe and High Flow cats. These sound amazing. Nice old school sound. East to install.

      Overkill

      Year: 2010 Submodel: GT500

      Helpful (2)

    Related Mustang Categories