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

100+ Reviews
Our Price

$418.70

  • Item #18422
  • MPN #817516
  • Market Price $464.99
  • You Save 10% ($46.29)
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Product Videos Customer Photos
Features
  • 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
Description
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.

Mustang Fitment: 2011 2012 Details

What's in the Box
  • (2) Muffler assemblies
  • (2) Clamps
Installation Info
Tech Specs
Axleback 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
Fitment
  • Boss 302 - 12
  • GT - 11, 12
  • GT500 - 11, 12

Most Helpful Reviews View All

Overall Rating 4.8/5 Write a Review
5/5

Top 1000 Contributor

Flowmaster Outlaw Axle-back for 5.0

If you want an aggressive muscle car, one that sounds like a 60's era, you need these mufflers! I turn heads everywhere I go with this system. It is louder than stock and has a slight drone at 2K RPM's.

Read More
Helpful (8) (0)

5/5
Very good, but not perfect.....

I've had the FRPP GT500's, Kook's, Roush, and now the Flowmaster axlebacks, OVERALL, the Outlaws are my favorite! The GT500's and Kook's had better exhaust TONE at WOT, but were too quiet during normal

Read More
Helpful (9) (1)

Videos

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 View Full Transcript

Customer Photos (19) View All

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Q & A (11 Questions, 11 Answers) Ask a Question

Is this a direct bolt on for my 2013 GT? I just want to know if this will bolt right up to my factory exhaust?

13GHGGT Year: 2013 Model: GT

Question Resolved
Good Question (0) (0)
  • Absolutely will! Just remove your stock axle-back and replace it with this new Flowmaster Outlaw!

    Helpful (2) (1)

    Best Answer

    LisaS Year: 1992 Model: GT

Show 4 more answers

will they fit my2013 v6 mustang

bree Year: 2013 Model: V6

Question Resolved
Good Question (0) (0)
  • I dont think so these exhaust are for V8 only

    Helpful (3) (0)

    Best Answer

    Lenin1 Year: 2012 Model: GT

Show 1 more answer

How loud is this exhaust compared to slp loudmouths axleback? I'm stuck between the two. I definitely want loud but not obnoxious loud. And when I say loud I mean outside loud. It's ok to be moderately loud inside but nothing vibrating my ears. Also I like the deeper growl sound over the high pitch nascar sound. Thats why I decided against rousch axlebacks. Hoping to get some good feedback. As I do plan on ordering my exhaust from you guys. I have watched numerous videos of just about any exhaust imaginable for the new 5.0 If theirs some other exhaust option that you think would better suit me I'm still open for suggestions. If it helps any on a scale of 1-10 with 10 being loudest I'm looking for 8 and half to 9. Thanks guys.

miteymike Year: 2012 Model: GT

Question Resolved
Good Question (0) (0)
  • Slp's sound like junk! Anyone who has them if u listen to them when they take off at a light , all u hear is raspy obnoxious sound & u think the guy is doing 100 mph! But he's doing 25! Slp's come on GM's , their not made for fords to sound good. Buy the flowmasters!!! U won't be dissatisfied! Magnaflows are a waste to so don't waste your money. Go with the flowmasters.. you'll be happy

    Helpful (3) (0)

    Best Answer

    kwmiked04 Year: 2004 Model: Cobra

    Top 500 Contributor

Show 3 more answers

Reviews (100+) Write a Review

  • 5 Stars .85 85%
  • 4 Stars .14 14%
  • 3 Stars .01 1%
  • 2 Stars 0 0%
  • 1 Stars 0 0%
4.8

out of 5 stars

98 Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume: 4.841584 4.8/5
  • Exhaust Note: 4.851485 4.9/5
  • Fit & Finish: 4.683168 4.7/5
  • Bang For Your Buck: 4.841584 4.8/5
Filter By Sort By
  • 5/5

    Flowmaster Outlaw Axle-back for 5.0

    January 28, 2012

    If you want an aggressive muscle car, one that sounds like a 60's era, you need these mufflers! I turn heads everywhere I go with this system. It is louder than stock and has a slight drone at 2K RPM's. It's not so bad that you can't have a conversation. One thing I particularly love about these is rumble when you let off the accelator and coast. Any video you see on the Internet with these does NOT do them justice! For the price especially, these are the best aggressive axle-backs on the market!

    Top 1000 Contributor

    xSMITHI3x

    Year: 2011 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Granbury, TX

    Helpful (8) (0)

  • 5/5

    Very good, but not perfect.....

    September 26, 2012

    I've had the FRPP GT500's, Kook's, Roush, and now the Flowmaster axlebacks, OVERALL, the Outlaws are my favorite! The GT500's and Kook's had better exhaust TONE at WOT, but were too quiet during normal driving. The Roush were the loudest at WOT, but sounded terrible, IMO. VERY raspy(4K and above)! They sounded good under normal driving, though. Now to the Outlaws. The tone is magnificent during normal driving; deep and the loudest out of the four I've had, but nothing obnoxious. The Outlaws aren't quite as loud as the Roush at WOT, but close. They're raspy as well, but not as bad as the Roush. There is some drone with the Outlaws, but nothing crazy. I actually like it! So, the Outlaws sound great under normal driving, semi-raspy at WOT(4K and above), but have the aggressiveness/loudness, overall, that I prefer. I wish there was an exhaust that had the loudness of the Outlaws, but no rasp at all like the GT500's/Kooks. However, with the stock cats and mid-pipe, the Outlaws are the best thus far! If you have any questions, feel free to email me: bruins17@gmail.com Mark

    Mark17

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Pasadena, CA, USA

    Helpful (9) (1)

  • 4/5

    Flowmaster Outlaws

    March 08, 2012

    Love the sound and overall product. Only one thing I did not like with the particular set I received is that the driver side tip was welded slightly to the right so the flowmaster emblem and drain hole are not exactly centered. I think it may be a factory defect for this particular set. Other than that, it's great.

    JHab

    Year: 2012 Driving Style: Street / Strip 'Stangs I have owned: 3 USAF

    Helpful (7) (0)

    • Response from AmericanMuscle

      It does sound like a factory defect as you mentioned. Please give us a ring and we can get you squared away with a replacement!

      Lisa , Content Specialist

  • 5/5

    This is how I wanted my GT500 to sound!

    April 01, 2013

    Like I said in the title- I wanted my '12 GT500 to sound more like the old days and my '66 and '69 Mustangs did. This'll do it! Wakes up the birds when you start up and gives you a nice tune when driving normal... but romp on the gas and that's when everything comes to life! The Outlaw axle backs are all I need to make those 550 horses come to life............ for now- of course!

    550Monster

    Year: 2012 Model: GT500 Driving Style: Daily Driver 'Stangs I have owned: 4 Whitesboro, NY, USA

    Helpful (3) (0)

  • 5/5

    2012 GT 5.0 axle back flowmaster outlaws

    April 11, 2012

    Install only took me 45 minutes for both sides. The sound is amazing over the stock mufflers, but there is a slight drone at highway speeds. I usually shift gears, crack the window, or turn up the radio if it bothers me which normally it doesnt.

    MikeF

    Year: 2012 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 El Paso, Tx

    Helpful (2) (0)

  • 5/5

    this product sounds mean

    February 11, 2012

    i would recommend this exhaust for everyone. it sounds good and really loud

    mattboss

    Year: 2012 Model: Boss Driving Style: Show 'Stangs I have owned: 3

    Helpful (2) (0)

  • 4/5

    very agressive exhaust system

    November 19, 2011

    I purchased these because I got a really good deal on them and decided to change up the sound a little. My previous setup was a lethal o/r x pipe and Roush. It sounded good but the tone wasn't really there. I put these on and now it has a deeper idle but isn't as loud as the Roush when you get on it. They are still really loud but better tone. The only downside is that they do drone a little but Idk if they do or not without an x pipe, doesn't bother me though so im happy with these.

    steven

    Year: 2011 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 columbus, ohio

    Helpful (2) (0)

  • 5/5

    First start-up said it all

    July 08, 2013

    This exhaust has a very mean sound which to me is best on start-up. I was in my garage and quickly put the pedal to the floor when I was showing a friend, and wow . . the walls simply shook. You will have quite a bit of interior noise and a rather loud drone at highway cruising speed, but a quick installation of some sound deadening in the trunk alleviated most of the issues so now it sounds very nice inside the car. My first installation of an exhasut on any car, and it was much easier than I expected.

    Skinny83

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 TX

    Helpful (1) (0)

  • 5/5

    Great sound

    July 25, 2012

    These flowmasters are awesome, and they are loud. They really give my stang the muscle car sound it should have. Everyone I know gives it a two thumbs up. I drove a 5.0 with The Roush mufflers and debated on getting them; however the flowmasters were on sale. I'm glad i got them, in my opinion, these sound way better.

    Steve210

    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Texas

    Helpful (1) (0)

  • 5/5

    Amazing Sound!!

    July 22, 2012

    These Mufflers Completely woke up my 2013 5.0. They sound incredible! I definitely recommend these to everyone. I can hear the power between every shift! only complaint is that they were a little nicked up when i received them.All in all great product. I buy everything for my Coyote from AM!!

    Top 1000 Contributor

    13GHGGT

    Year: 2013 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 5 Ohio, USA

    Helpful (1) (0)

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