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Flowmaster Outlaw Cat-Back Exhaust - Stainless Steel (11-12 GT)

AmericanMuscle no longer carries the Flowmaster Outlaw Cat-Back Exhaust - Stainless Steel (11-12 GT). Please check out 2010-2014 Mustang Cat-Back Exhaust for an updated selection.
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Flowmaster Outlaw Cat-Back Exhaust - Stainless Steel (11-12 GT)
28 Reviews 16 Answers

Features, Video & Details

  • Super Aggressive Flowmaster Outlaw Sound
  • 409 Stainless Steel Construction
  • 3" Mandrel-Bent Tubing
  • 4" Polished Stainless Steel Tips
  • Includes Scavenger X-Pipe and (2) Outlaw Mufflers
  • Fits 2011-2012 GT Mustangs

Product Resources

Customer Photos (3) Customer Reviews (28) Questions (16) & Answers (16)

Review & Installation Video

Review & Install Video

Hey I’m Justin with AmericanMuscle.com, and I’m going to be breaking down the Flowmaster stainless steel Outlaw series catback exhaust, fitting all 2011 and 2012 Mustang GTs. This system gets its name from the two race orientated outlaw series straight through mufflers, which are going to be a lot more aggressive than the majority of Flowmaster’s other street offerings, such as the super 44 or delta flow for example. In fact, Flowmaster claims the outlaw series is the most aggressive system available for your coyote Mustang. This exhaust also features 3” mandrel bent tubing throughout and a full 409 grade stainless steel construction. It is worth mentioning that Flowmaster includes what they refer to as their scavenger style crossover pipe, which does take the place of a traditional X or H pipe. Flowmaster claims that this design actually makes a little more torque than those other traditional mid pipes, and it’s something they use in all of their catback designs. Finally everything exits out those 4” polished tips, embossed with that sick Flowmaster logo. Since this is a Cat-Back, you can expect a slightly more involved install that should take you roughly 2 hours from start to finish using basic hand tools. Now let’s hear how the Flowmaster Outlaw series catback sounds compared to our factory exhaust.

Super Aggressive Flowmaster Sound. Give your coyote powered Mustang that unmistakable Flowmaster sound with the Outlaw Series Cat-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.

Race Car Growl. The included Scavenger X-Pipe not only helps increase power, but it also adds a loud raspy, race car growl to the sound of your exhaust with its modern "X" crossover pipe design.

Reuses Stock Cats. The X-Pipe bolts up directly behind the factory catalytic converters with no cutting required saving you time and money. By reusing your stock catalytic converters, you ensure that your Mustang is smog-legal.

Stainless Steel Construction. Constructed from durable 3" diameter 16 gauge 409 stainless steel tubing for it's corrosion resistant properties, the Flowmaster Outlaw Cat-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 Stainless Steel Cat-Back Exhaust System is designed to fit the 2011 to 2012 GT Mustangs equipped with either aftermarket shorty headers or the factory manifolds.

Freight Notes. Freight items can only be shipped within the continental 48 states, no expedited methods. What is freight shipping? Your Answers are Right Here!.

Fitment: 2011 2012 Details

MPN# 817560

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

What's in the Box
  • (1) Right muffler assembly
  • (1) Left muffler assembly
  • (1) Scavenger X pipe assembly
  • (1) Right intermediate pipe
  • (1) Left intermediate pipe
  • (4) Band clamps
  • (2) Hanger keepers
Installation Info
Tech Specs
Axle-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished Stainless Steel
Piping Size: 3" Tip Size: 4.0"
Muffler Type: Straight-through Fitment: 2011-2012 GT
Will it fit my Mustang?

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Customer Photos (3) Submit Your Photo

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Questions & Answers (16)

5 Top Rated Questions

How would this exhaust compare to the Roush axle-back, I currently have installed on my 2012 tone/loudness wise?

  • Hi,This Flowmaster Outlaw Cat-Back Exhaust is louder than the Roush Axle back i suggest taking a look at the video we have on this items page to listen to it.

Helpful (1)

Will Dynatech 1-7/8 in. SuperMAXX Long Tube Headers work with this?

  • Unfortunately, as we no longer carry this item we would be unable to verify fitment.

Helpful (0)

Well this fit the BBK long tube headers

  • As long as you have the shorty mid-pipe from BBK this will fit yes.

Helpful (0)

Just wondering if the x pipe on this kit is the same length as the stock H pipe? I would like to put long tubes and catted x pipe on down the road and want to know if and after market catted H pipe and long tubes will hook into the axle over pipes or if they will be to short? Thanks

  • Yes, the x-pipe that is included in this exhaust kit would be the same length as the stock h-pipe. You would definitely be able to switch out the x-pipe for a shorter mid pipe once you upgrade to long tube headers.

Helpful (0)

would these fit even tho i already have bbk long tubes and o/r x-pipe

  • The Flowmaster Outlaw Cat-Back Exhaust is designed to fit with stock manifolds or aftermarket shorty headers.

Helpful (0)
Post Your Question
10 More Questions
Will I be able to swap out the x pipe for an H pipe, such as item number 69200. Will any cutting or welding be required or would it bolt up as it would with a stock exhaust? 1 answer
Hi, just from my expierence, there are not a lot of real loud sounding exhaust for the 2010 v6. This exhuast gives off a real mean, loud sound and is there any way, even if it means to spend a couple more bucks, to put this exhuast on a 2010? 1 answer
I have this system and it sounds great but the drone at 70 mph is terrible whay would solve this? 1 answer
I read if you buy the mufflers by themselves that they're 2.75 inch inlet. This description says 3 omg but is it referring to the mid-pipe being 3 inches in diameter or are they both 3 inches in diameter? 1 answer
Does this Scavenger style X-Pipe hang down lower under the car then the factory mid pipe? 1 answer
what if any long tubes will fit these. I have this setup on my 2011 mustang gt and im going to buy some long tubes. Which long tubes will fit this catback system. 1 answer
Does this system remove the cats? 1 answer
Headers Will Pypes polished long tube headers work with this? If so I wouldn't need to buy an X-Pipe correct? 1 answer
Will these fit a new 2014 GT? I was wondering if these catbacks would fit my 5.0 2014. 1 answer
Tune I have a aftermarket tune. Do I need to get a new one if I install this? 2 answers

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Customer Reviews (28) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 4.962963 5.0
  • Exhaust Note 4.888889 4.9
  • Fit & Finish 4.555555 4.6
  • Bang For Your Buck 4.777778 4.8



  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    January 21, 2019

    Excellent catback system.

    I bought this to replace a previous flow master aluminized axel backs when I first bought my 2011 GT/CS. Excellent, in every way shape and form for catback exhaust system. The sound was a huge improvement over my axel backs, and all I can say is I’m heavily impressed.

    KevinM

    Year: 2011 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    October 27, 2018

    Amazing volume

    This exhaust from a cold start in truly something to behold, and at WOT it is amazing; the only real downside to this system is the drone while on the freeway, its not horrible, but its definitely something you notice. I managed to knock this install out in about an hour, as that's as long as I had access to a lift.

    Hessian5k

    Year: 2012 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    August 02, 2018

    So loud!!!

    I did a muffler delete a few months ago, but wasn't satisfied with the end result. I purchased this hoping to clean up the tone bit, but wasn't expecting it to be much louder. From the first cold start I soon realized that my neighbors will hate me, but I couldn't be happier. Immensely satisfied with this purchase.

    JeremyT

    Year: 2012 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    June 28, 2018

    New exhaust

    Awesome 3 inch stainless steel with 4 inch tips looks and sounds great

    Samuel

    Year: 2012 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    May 26, 2018

    A fantastic Purchase

    So I took my mustang out to a buddies shop to have this installed , two of the guys there put the exhaust up for me it took them about an hour and 45 minutes maybe 2 hours start to finish. I think if you want a loud exhaust that has a great burble at idle , a great acceleration sound and a very sexy decell burble then this is the one for you. I could not be happier about this. Then again If you dont want loud then dont go with this one.

    KyleM

    Year: 2011 Submodel: GT

    Helpful (3)

  • 5/5

    May 24, 2018

    Beast Mode!

    Very, very happy with this setup! This exhaust brings out the inner beast in your stang. Definitely a head turner when your rippin down the street... I've gotten tons of positive feedback from my friends and randoms that give you the thumbs up when you drive by! Would definitely recommend this to the next buyer, I also passed emissions with flying colors :)

    DanteE

    Year: 2011 Submodel: GT

    Helpful (3)

  • 5/5

    Installation Time: Shop Install

    October 19, 2017

    Why aren't you getting this already!!!

    To put it in simple words, this was my best purchase I have ever done so happy with the final outcome of my car sounds mean and aggressive how mustangs should sound like

    Rigoberto

    Year: 2012 Submodel: GT

    Helpful (4)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    September 01, 2017

    Great sound!

    Definitely turns heads! Deep and wonderful sound. Looks good installed as well.

    ScottM

    Year: 2012 Submodel: GT

    Helpful (4)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    June 26, 2017

    Toooooooooooooooo loud but lovely

    Maaaaaaaaaaan these are loud. The exact reason you love the Mustang makes you believe that you can challenge any vehicle that approaches. Wooooow just awesome. It channels that inner child OMG CAN'T RESIST WIDE OPEN THROTTLE. sounds like God telling you to keep going

    RickFavor

    Year: 2011 Submodel: GT

    Helpful (5)

  • 5/5

    Installation Time: Afternoon

    June 23, 2017

    Great product

    Exactly what I was looking for great sound videos don't do it justice

    MarlonT

    Year: 2012 Submodel: GT

    Helpful (3)

  • 5/5

    Installation Time: Shop Install

    February 27, 2017

    LOUD

    I wanted the loudest exhaust I could find with an aggressive note and I found what I believe to be the best choice for a mustang driver who wants his car to sound like Godzilla and King Kong had a baby and hopped him up on roids. Great buy, 25/10

    AdamF

    Year: 2012 Submodel: GT

    Helpful (5)

  • 5/5

    December 05, 2016

    Great

    Very loud! Gives you the desired rumble that mustangs should come with

    Speed

    Year: 2012 Submodel: GT

    Helpful (5)

  • 5/5

    October 07, 2016

    Legit!!!

    I had ProDyno in SC install the outlaw kit and it only took about an hour. No issues with install due to fitment and that these guys are legit pro's. You won't regret buying this kit! I had the outlaw mufflers on my 08 GT/CS and it sounded awesome so I had to get the x-pipe and muffler kit for my 2011 GT. It's a real quality kind of loud past 2000 rpm's. It's a semi-mild growl at idle unless it's a cold start lol. There is a noticeable difference in power but nothing spectacular(without a tune). I've done all kinds of research and THIS IS THE KIT TO GET!!

    Eric

    Year: 2011 Submodel: GT

    Helpful (5)

  • 5/5

    September 12, 2016

    Better than expected

    Love the new sound. Cold starts sound amazing, cabin drone around 2000rpm but while cruising it's a low growl. Very happy.

    cdub360

    Year: 2011 Submodel: GT

    Helpful (5)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    February 17, 2016

    Best purchase I have made so far!

    I had researched multiple catback systems. I was looking for an aggressive system that wasn't full of drone or popping and cracking. I could not have made a Better decision going with the outlaw. I had a local shop install took about 2 hrs and was done for 80$ plus tax. Thank you American Muscle as their customer service is second to none. and their products come in perfect condition within a couple of days in the east coast.

    Coyote50

    Year: 2011 Submodel: GT Huber heights ohio

    Helpful (3)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    September 11, 2014

    Unbelievable sound!

    This by far has got to be THE best exhaust I've ever heard! Will definitely turn plenty of heads. I had mine installed at a shop and even they were impressed with the sound. There is a very very minor drone at about 2100-2200 rpm but I personally love it! Worth every penny! Highly recommended if you want your 'stang to sound like nothing else out there.

    ChrisGTCS

    Year: 2011 Submodel: GT

    Helpful (5)

  • 5/5

    Installation Time: Afternoon

    August 27, 2014

    Louder then i thought

    Took some time getting the stock exhaust off and needed plenty of room to put the new one on, sounds really good almost like not having a exhaust at all

    Cruiserlevi2005

    Year: 2011 Submodel: GT Perryville, MO 63775, USA

    Helpful (5)

  • 5/5

    Installation Time: Less than 1 Hour

    February 23, 2014

    Amazing sound!!

    This exhaust makes the mustang sound mean and aggressive! It's what every mustang should sound like! Definitely worth every penny!

    Keith13

    Year: 2012 Submodel: GT San Antonio TX

    Helpful (5)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    November 19, 2013

    Looks awesome, sounds loud, and worth the $

    Went from GT500 axlebacks to this system and its much louder at startup and thru all rpm ranges. There's drone around 2k rpm as most other people noted. If you want a system without drone then this isn't for you. It's a very solid product and worth the money for what you get.

    jaxmustang2013

    Year: 2012 Submodel: GT Jacksonville, FL, USA

    Helpful (5)

  • 5/5

    Installation Time: Afternoon

    November 07, 2013

    Installed on my 2012 Mustang GT

    Just as your site stated, the fit and finish are superb. I was blown away by the quality of the pipes. The installation went off with out a hitch, everything is beyond reproach . A excellent and quality product. I love my Outlaw Cat back Exhaust!

    Brian1987

    Year: 2012 Submodel: GT Pasco,WA

    Helpful (6)

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