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

Flowmaster Outlaw Cat-Back Exhaust - Stainless Steel (11-12 GT)
21 Reviews 6 Answers
Market Price $983.99 You Save 13% ($129.02)
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$854.97

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  • Item 18430

  • MPN# 817560

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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 (21) Questions (10) & Answers (6)

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.

Fitment: 2011 2012 Details

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?
  • Boss 302 - 12
  • GT - 11, 12

Designed to be used with the factory manifolds or aftermarket shorty headers installed.

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
Outlaw Catback System

This is definitely an aggressive sounding system. Bought this system for my brother's 2011 GT and it has improved the exhaust sound tremendously. If you're looking for a better sounding Mustang without ...

Read More
Helpful (3)

5/5
Totally different car now'

Shipping wast fast! Day I got it bad boy went on lift and was installed " get a friend because it just makes the installation a breeze" sounds is amazing all the guys at work love it buddy of mine has ...

Read More
Helpful (2)

Overall Rating 4.8 out of 5 stars
Read All 21 Reviews

Customer Photos (3) Submit Your Photo

View All 3 Photos

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10 Questions / 6 Answers

Ask a Question

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

Hessian5k

  • 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.

    Chris J

Helpful (1)

I have this system and it sounds great but the drone at 70 mph is terrible whay would solve this?

BradenA

  • The only way to solve a drone issue would be to change a component on the exhaust, such as the addition of a resonator or the use of a different muffler.

    AMjordan

Helpful (0)

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?

Eric

  • Hello! The Flowmaster Outlaw Cat-Back Exhaust has a 3 inch diameter from the mid pipe to the exhaust tips which are 4 inches in diameter.

    VincentV

Helpful (0)

Does this Scavenger style X-Pipe hang down lower under the car then the factory mid pipe?

AC

  • The Flowmaster Outlaw Cat-Back Exhaust should fit relatively close to the OE exhaust, however, since the exhaust diameter is slightly larger, it will rest slightly lower than the original equipment.

    AMJEFF

Helpful (0)

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.

Gavin

  • Any set of long tube headers for the 2015 to 2017 Mustang will fit the Flowmaster Outlaw Cat-Back Exhaust as long as the proper long tube header adapter pipes are purchased along with them.

    SalC7

Helpful (0)

Does this system remove the cats?

Johnny

  • No, this system attaches to the CAT downpipe behind the second set of O2 sensors. It just bolts in where your factory H-pipe did without altering the CATs.

    CTTillman

Helpful (0)

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Customer Reviews (21) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 5 5
  • Exhaust Note 4.85 4.9
  • Fit & Finish 4.55 4.6
  • Bang For Your Buck 4.7 4.7



  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    March 23, 2013

    Outlaw Catback System

    This is definitely an aggressive sounding system. Bought this system for my brother's 2011 GT and it has improved the exhaust sound tremendously. If you're looking for a better sounding Mustang without deleting the cats, then this is the system to have.

    J35Lew

    Year: 2011 Submodel: GT

    Helpful (3)

  • 4/5

    Installation Time: Afternoon

    July 24, 2013

    Amazing sound!!

    Was going to get a Borla exhaust until I heard the flowmaster on a youtube video and then saw How much cheaper it was. Exhaust came in about a week after ordering with no issues thanks to American muscle. Stock exhaust was a pain to remove but eventually managed it. After that it was relatively smooth sailing fitting the flowmaster on. First start up with the flowmaster in blew my mind. It was making the whole shop my car was in shake it was so loud. The video in the Internet doesn't even do this exhaust justice. I definitely recommend this product.

    Evolution

    Year: 2012 Submodel: GT Edmonton, AB, Canada

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    July 01, 2013

    Totally different car now'

    Shipping wast fast! Day I got it bad boy went on lift and was installed " get a friend because it just makes the installation a breeze" sounds is amazing all the guys at work love it buddy of mine has the outlaw mufflers not the cat back big difference absolutely amazed with product

    MikeGT124

    Year: 2011 Submodel: GT Corpus Christi, TX, USA

    Helpful (2)

  • 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 (1)

  • 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 (1)

  • 5/5

    December 05, 2016

    Great

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

    Speed

    Year: 2012 Submodel: GT

    Helpful (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 5/5

    Installation Time: Afternoon

    August 26, 2013

    Stupid LOUD!!

    These exhaust are really loud. I get asked all the time if i have straight pipes and they're surprised when i tell them i still have stock headers and cats. If you're looking for loud and raspy this is the exhaust to get. As for installation you will most likely need a lift to get the stock over axle pipes off and the new ones on.

    WillyWonka08

    Year: 2011 Submodel: GT MD

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    August 26, 2013

    BEST EXHAUST HANDS DOWN!

    When i bought my 11' GT first stop was exhaust! I was first going to mismatch mufflers and x-pipes but decided to just take the guess work out and buy the complete Flowmaster catback. Fitment was no issue (car lift highly recommended). Took me and my friend about an hour or so. Muffler tips were centered with bumper cutouts & everything tightened down perfectly. Now lets get to the best part... THE SOUND. This exhaust is the perfect tone anyone would ever need. This is the loudest and most aggressive tone while still keeping your cats in place. I can have the monsterously loud sound while still keeping my cats in place. No check engine lights, no worries! This is one of the most affordable catbacks on the market right now. For anyone thinking of buying it... DO IT! You will love it!!

    Kpurdz

    Year: 2011 Submodel: GT West Chester, NY

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    September 05, 2012

    HOLY $%&@... Loud!!!

    this is by far the loudest and most aggressive exhaust i've every had on any mustang. that being said i had a 347 fox mustang with full mac exhaust with long tubes and this system puts that to shame. i paid about $80 to have this installed and the shop really had to do some tweaking to get them right, plus they had to tack weld the pipes because even when they were tight the pipes were still moving. i wasn't sure about this system when i first installed it but after a week of driving it broke in well and sounds amazing. if you want a dramatic exhaust change that will blow everyone away this is the exhaust you want. its super aggressive and really sounds like a race car. drone is very minimal and when you're at cruising speed or idle there is almost none. when you decide to open it up be prepared because this system will rock your world. glad i went with this system now, just waiting on the flowmaster shorty headers they just released to show up on AM to finish the package off. i would definitely buy these again now that i've had them for a bit.

    Mayhem12

    Year: 2011 Submodel: GT Albion NY

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    August 24, 2012

    Blew my mind!

    I tell you what guys, this is the best bang for your buck around! I would recommend taking it to a muffler shop to install as the stock over-axle pipes are a PITA to remove. Lining everything up does take patience but i had mine installed for 75$ and it took 1.5 hours. These are really loud. I just wasnt expecting the throatiness of this exhaust!! Deep low and subdued rumble at idle and sounds really good when slowly accelerating. When you mash it this screams! My favorite is when passing other cars, it echoes off everything. Minor drone between 1800-2200 with my 3.73s. Nothing the radio doesnt fix and my 3 year old falls asleep to them. Windows up it isnt too loud!

    Slowbra302

    Year: 2013 Submodel: GT Oceanside, CA, USA

    Helpful (1)

  • 4/5

    Installation Time: Afternoon

    August 15, 2012

    Good but frustrating product

    good product but the installation gets a little frustrating. Takes a lot of tweaking to get the mufflers to line up. Sounds great overall though.

    Bills5oh

    Year: 2011 Submodel: GT Niceville, FL, USA

    Helpful (1)

  • 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 (0)

  • 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 (0)

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