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

100+ Reviews
Our Price

$430.97

  • Item #18422
  • MPN# 817516

  • 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
  • 2.75" 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.

Fitment: 2011 2012 Details

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?
  • Boss 302 - 12
  • GT - 11, 12
  • GT500 - 11, 12

Most Helpful Reviews

5/5
Newborn Beast

Exhausts are almost a little too loud, but that's a good thing in my book. It really makes your V8 sounds like a BIG V8. Setting off car alarms as you drive by. Cold starts are ridiculously beefy sounding. ...

Read More
Helpful (1)

5/5
TURNED MY 2012 5.0 INTO HEAD TURNER

I purchased these axle-back Flowmasters they are Awesome the videos do not do them any Justice. The sound it just what this muscle car needed ,It took lees than 30 minutes with ramps and 13mm socket easy ...

Read More
Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 100+ Reviews

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.

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11 Questions / 8 Answers

Ask a Question

Which axle back muffler system is louder the flowmaster outlaw series or the heartthrob muffler delete system for 2012 Mustang GT ?

LuisQuian

  • The Flowmaster Outlaw axle-back is as loud as you can get with only axle-back replacement. There is no muffler on this system, it's basically a straight pipe. I'm not sure but I think the shape of the tubing may give it some sound quality. When I bought this set I though it was too loud on the highway but now I'm getting used to it.

    Jlew

    Good Answer (0) (0)

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

will they fit my2013 v6 mustang

bree

  • I dont think so these exhaust are for V8 only

    Lenin1

    Good Answer (4) (0)

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

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

  • 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

    kwmiked04

    Good Answer (4) (0)

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Customer Reviews (100+) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume 4.837607 4.8
  • Exhaust Note 4.854701 4.9
  • Fit & Finish 4.683761 4.7
  • Bang For Your Buck 4.863248 4.9



  • 5/5

    Installation Time: Less than 1 Hour

    March 30, 2013

    TURNED MY 2012 5.0 INTO HEAD TURNER

    I purchased these axle-back Flowmasters they are Awesome the videos do not do them any Justice. The sound it just what this muscle car needed ,It took lees than 30 minutes with ramps and 13mm socket easy to adjust and the rumble is just outstanding thank you American Muscle for the prompt delivery,I definitely recommend these mufflers

    LEHMAN111

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 4 San Diego, CA, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    January 22, 2013

    Newborn Beast

    Exhausts are almost a little too loud, but that's a good thing in my book. It really makes your V8 sounds like a BIG V8. Setting off car alarms as you drive by. Cold starts are ridiculously beefy sounding. Outlaws are amazing!

    MartinGT

    Year: 2012 Model: GT Driving Style: Race 'Stangs I have owned: 1 Imperial, CA

    Helpful (1) (0)

  • 5/5

    October 09, 2012

    Beastly

    Quick delivery and no defects noted in the muffles Installation (by myself) was not too bad though the instructions were not completely accurate for me (neither side would slide off the front hangers like the instructions stated so I unbolted the hanger bracket on the passenger side and loosened the bracket on the driver side to get the clearance needed to get the factory muffles off the hangers). Hardest part of the installation was removal of the driver side factory muffler. Now that I know how to deviate from the instructions, installation would easily be less than an hour (took me almost an 1 1/2 hours, mainly because of problems with the driver side). As many have said, the videos do not do the sound of the outlaws justice. Also as stated, there is a drone around 2k rpms. They are actually louder than I really wanted (because of the pesty neighbors) but I love that my 2011 GT now sounds like a muscle car should sound. Great product!

    Delanos

    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Augusta, GA, USA

    Helpful (1) (0)

  • 4/5

    Installation Time: Less than 1 Hour

    March 08, 2012

    Flowmaster Outlaws

    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 (8) (0)

    • Response from AmericanMuscle

      Lisa , Content Specialist

  • 5/5

    Installation Time: Afternoon

    January 28, 2012

    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. 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!

    xSMITHI3x

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

    Helpful (8) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    September 26, 2012

    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 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)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    April 01, 2013

    This is how I wanted my GT500 to sound!

    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

    Installation Time: Less than 1 Hour

    July 08, 2013

    First start-up said it all

    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 (2) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 22, 2012

    Amazing Sound!!

    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!!

    13GHGGT

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

    Helpful (2) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    April 11, 2012

    2012 GT 5.0 axle back flowmaster outlaws

    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)

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