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

100+ Reviews
Our Price

$430.97

  • Item #18423
  • MPN# 817511

  • Market Price $487.00
  • You Save 12% ($56.03)
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Product Videos Customer Photos
Features
  • 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
Description
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?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10
  • GT500 - 07, 08, 09, 10

Most Helpful Reviews

5/5
2008 Mustang Bullitt

I purchased these for my 2008 Bullitt and they are awesome. These mufflers sound unlike any other exhaust that I have ever heard. They have the flowmaster sound, but there is also a distinct burble sound. ...

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Helpful (4)

5/5
Flowmaster Outlaw Series Axle-Back Exhaust

Great Sounding Exhaust I was very anxious to put them on my 2010 GT. They have a classic muscle car growl when idle and they roar like raging thunder when letting the throttle out. After I installed them ...

Read More
Helpful (4)

Overall Rating 4.9 out of 5 stars
Read All 100+ Reviews

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.

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16 Questions / 10 Answers

Ask a Question

Flowmaster or bassani Which ones sound better and have less restriction?

Ortiz12

  • When it comes to sound it's all what YOU think sounds beter to be completely honest. I have flowmasters on my 1994 Mustang and my best friend has a bassani exhaust setup that sounds pretty nice. I would recommend searching youtube for the different videos. When it comes to axleback however, It won't be as loud as you are probably expecting. I would recommend a completely new exhaust from the headers back. If that's too expensive though this is the cheaper alternative.

    TBang

    Good Answer (1) (0)

Show 2 more answers Question Resolved

Need tuning? I drive a 2008 mustang gt and I'm wondering if I get these axle back exhausts will it affect my tuning in anyway or will I need tuning I don't have anything aftermarket like CAI, TURBOS, etc. just wondering Thanks

TOoCool

  • Axle-backs do not require a new tune once installed. Just bolt on and enjoy your new exhaust!

    LisaS

    Good Answer (0) (0)

Show 4 more answers Question Resolved

Shelby GT Anyone put these on a 2005-2007 Shelby GT? Do they fit the same as stock?

minipoppa

  • yes you will love the sound!!

    Captmike

    Good Answer (0) (0)

Show 1 more answer Answer This Question I need this answered (0) (0)

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Customer Reviews (100+) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume 4.866337 4.9
  • Exhaust Note 4.90099 4.9
  • Fit & Finish 4.638614 4.6
  • Bang For Your Buck 4.791045 4.8



  • 5/5

    June 10, 2016

    Let them hear you before they see you.......

    I was running the Flowmaster American Thunder Aggressive axle back exhaust on my 2006 GT which sounded good but after having these installed and the excitement of the first turn of the key all I can say is that these Outlaws make the difference in a HUGE way. Deep and throaty with just the right amount of head turning noise and not too annoying. Trust me, you WILL turn heads with these. I am really glad I made the switch. Perfect for my Pony. They sound freakin' awesome! To all you Pony lovers out there if you are thinking about it go for it! You will love them! Thanks American Muscle for the Fast and Free shipping and the great price on these. Worth every penny!

    GruntMarine

    Year: 2006 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 4

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    May 03, 2014

    2006 Mustang GT Outlaws

    The Outlaws are a great choice for anyone who wants a loud exhaust but doesn't want the raspyness of a muffler delete. Fit and finish for me personally wasn't great but I think that is because someone had messed with my stock axle backs because the hangers were way off. But it only took an extra 30 minutes or so to make new hangers so it wasn't bad at all. And now I have nice new non rusted hangers. Overall took about 2 and a half hours or so to install them and get them perfectly lined up. As a little back story, I wanted something that had an old muscle car sound which Flowmaster seems to be the best at. A lot of Mustangs go for that European V8 sound which sounds amazing. But I wanted to go a little old school. And I wanted something loud. Ok so far as sound goes, they are loud but not unbearably loud. The have a little popping on decel or when you rev past about 4k. The exhaust note itself is really good. It's really deep and in the low RPMS and has that old school sound, however it has almost a European V8 mixed with an old school sound, it's really a sound kind of all it's own. And I have to say I really like it. It's old school but with a twist. Overall I am really happy with them, however I can see that if I go with long tubes as well as possibly no cats these may be to loud. If you are just going to do axle backs these are almost perfect in volume. They do kind of break in as time goes on and they get a little more quiet and they get a little more burble to them. Fit I can see as being spot on as long as no one has messed with the factory hangers like they did mine. I would Highly recommend this product.

    Kyle31

    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1

    Helpful (2) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 04, 2013

    Outlaws are great

    These (and the BBK CAI) were my first mods to my 06 GT. They look great and sound fantastic. I had the luxury of being able to use a lift at a dealer. I'm sure it would have been a little more difficult without the lift. But it was very easy.

    Doug06Vista

    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    October 19, 2013

    V6 Outlaw

    It is difficult to know what an exhaust will sound like when you have a V6 with duals, since no one makes it. So you just have to do a lot of research, and these were the best I could find. I was already running Magnaflow Magnapacks, and I must say these made for quite the improvement and created the sound I was searching for all along. There is a bit of drone that makes my louver rattle, but many exhausts do. Would def. recommend this exhaust for fellow sixers!

    MustangPope05

    Year: 2005 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Greenville, SC

    Helpful (2) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    April 21, 2013

    The Outlaws

    Killer growl when you put your foot in it, but not so loud that the neighbors are giving you the evil eye while cruising the back streets. The sound attracts lots of attention in parking lots and intersections too, but isn't that why we drive these things?

    Tattude

    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2

    Helpful (2) (0)

  • 4/5

    Installation Time: Less than 1 Hour

    March 05, 2013

    Outlaw exhaust

    I got the outlaws for my girls 2007 GTCS. They look good on the car and sound great. I wanted something that was inexpensive yet would sound good. these are straight through design which I was afraid would be too loud for her. The reviews all said they were extremely loud but I didn't think so. ( of course that's compared to my 2011 GTCS with long tube headers,x-pipe and borla axelbacks) I was almost expecting louder cause of the reviews but the note is a great flowmaster sound and I'm pleased overall. Easy install less than an hour with hand tools.

    dmac

    Year: 2007 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 3 Oklahoma

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    April 28, 2012

    Flowmaster Outlaw Series Axle-Back Exhaust

    Great Sounding Exhaust I was very anxious to put them on my 2010 GT. They have a classic muscle car growl when idle and they roar like raging thunder when letting the throttle out. After I installed them you could really tell the difference between the stock mufflers and the new FlowMasters. The exhausts look great , and the material these exhausts are made of is very durable and they should last a long time. Great fitment, installation was an hour and a half and only a few tools were needed. This is a project that can be done in your garage, jacked up in your driveway or on a lift at an auto craft shop. Now when my vehicle rides through any town I leave crowds staring and people compliment me on the sound.

    Tstacks91

    Year: 2010 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Clinton, MD

    Helpful (4) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 08, 2012

    2008 Mustang Bullitt

    I purchased these for my 2008 Bullitt and they are awesome. These mufflers sound unlike any other exhaust that I have ever heard. They have the flowmaster sound, but there is also a distinct burble sound. They work well with the car and turn many heads. I would definitely recommend them to anyone.

    Bang465

    Year: 2008 Model: Bullitt Driving Style: Daily Driver 'Stangs I have owned: 1 Jackson, TN

    Helpful (4) (0)

  • 5/5

    Installation Time: Afternoon

    June 18, 2013

    You will love them...your neighbors won't!

    I am not big on writing reviews but after installing these, I felt AM and Flowmaster deserved a review. First off, thanks AM for getting these to me in less than 24 hours, can't ask for much more than that. Secondly, I am a very amateur wrencher, I've done the majority of the work on my car minus my cam installation, and these went in perfectly. Removing the old hangers is a different story. Removing rusted in bolts, located where only a 9 year old girls hands could reach was a pain, so it took me a little longer than the typical hour long install noted by other reviewers. My suggestion is putting penetrating oil on the (8) bolts the night before, and using anti-seize during the re-install. Now to the good part, I have basic bolt-ons including Steeda cold-air kit, Comp Stage II VSR cams, Kooks long tube headers, and a custom tune. Previously I had Flowmaster American Thunders mounted which I loved but after watching a few re-runs of Monster Garage and hearing the phrase "if you can't hear it before you see it" kicked around, I decided to get something a bit less dainty. Let me tell you, these make my GT sound like an absolute terror coming down the street. Some days I will go out and cruise around in 2nd gear and will be giggling like a little girl the entire way. It is definitely an acquired sound, differing from the AT Flows with their low and lopey sound. These sound more like a semi-truck rolling down the thruway. Like many other reviewers, it does have a decent amount of drone; I'm geared at 4.10's so I get it around 1800-2200rpm. It can be a little annoying but it is easily remedied by giving it a little more gas. And WOT is simply devastating. If you enjoy driving down a city street and setting off every car alarm along the way, or getting the finger by the Audi driver next to you who can't hear his blu-tooth phone call, then the Outlaws are for you.

    rmfinley82

    Year: 2005 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1 Buffalo, NY, USA

    Helpful (30) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    April 12, 2012

    Best exhaust ever!

    Loud and throaty!!! if you want sound from an exhaust this is your product!! It still has the flowmaster signature sound note!!! I'm really happy with this purchase!! There is nothing else like it!! It will wake your neighboors and rattle your house windows!! You will turn heads with this exhaust!! My girl friend loves it as well! even on the freeway you can still hear the exhaust note!!

    Mikehb

    Year: 2009 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3

    Helpful (3) (1)

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