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Flowmaster Outlaw Cat-Back Exhaust w/ X-Pipe - Stainless Steel (13-14 GT)

Flowmaster Outlaw Cat-Back Exhaust w/ X-Pipe - Stainless Steel (13-14 GT)
50 Reviews 8 Answers
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  • Item 18444

  • MPN# 817590

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Flowmaster Outlaw Cat-Back Exhaust w/ X-Pipe - Stainless Steel (13-14 GT)

Flowmaster Outlaw Cat-Back Exhaust w/ X-Pipe - Stainless Steel (13-14 GT)
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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 Two Flowmaster Outlaw Mufflers
    • Fits 2013-2014 GT

    Product Resources

    Customer Photos (12) Customer Reviews (50) Questions (19) & Answers (8)

    Review & Installation Video

    Review & Install Video

    Hi I'm Justin with AmericanMuscle.com, and I'm going to be breaking down the Flowmaster Stainless steel Outlaw Catback exhaust system fitting all 2013 Mustang GTs. This system gets its name from the two, race oriented, straight through design Outlaw series mufflers, which are going to be far more aggressive than Flowmaster's other street offerings, such as the super 44 or the delta for instance. In fact, Flowmaster claims that this system, is the most aggressive system they produce for the Coyote Mustangs. Taking a closer look at the entire system, you will notice that Flowmaster chose to go with a quality 409 grade stainless steel throughout, including the 3" mandrel bent tubing, through those Outlaw series mufflers, all exiting out these brightly polished 4" tips. Since this is a Catback, you can expect a slightly more involved install, that should take you about 2 hours from start to finish when it's all said and done. Now let's hear how the Flowmaster Outlaw series 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 included Flowmaster Scavenger 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 2013-2014 5.0L coyote Powered GT Mustang equipped with either aftermarket shorty headers or the factory manifolds. Does not fit Shelby GT500 models.

    Fitment: 2013 2014 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: 2013-2014 GT
    Will it fit my Mustang?
    • Boss 302 - 13
    • GT - 13, 14

    People Who Bought This Item Also Bought

    Most Helpful Reviews

    5/5
    LOOOOOOUD! BE AWARE!

    This system is ABSOLUTELY LOUD! I'm afraid to hit over 2k RPM in Koreatown, Los Angeles where I live. There are lots of cops out there. I have watched Outlaw axle-back in YouTube, but I haven't really ...

    Read More
    Helpful (9)

    5/5
    Best deal around, better than i expected.

    This is my 4th Mustang and I have used Flowmasters, Borla and Pypes in the past. I know the new 5.0 Coyote is a real animal and a good set of pipes would go a long way but this was even more than i could ...

    Read More
    Helpful (7)

    Overall Rating 4.8 out of 5 stars
    Read All 50 Reviews

    Customer Photos (12) Submit Your Photo

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    19 Questions / 8 Answers

    Ask a Question

    is it possible to weld new flowmaster tips onto the outlaw catback? i want to get dual tips

    JonnyZed

    • While it is possible to weld new Flowmaster tips to the end of the Outlaw catback, you will be modifying the sound that is produced when going from a dual tip to a quad tip setup. Not to mention that you will need a new GT500 rear valance to accommodate the new tips as the stock rear valance is too small to fit the quad tip exit on it.

      KevinD92

    Helpful (1)

    Catback vs. Axleback Is there a noticeable difference in exhaust tone and/or performance between the axleback outlaws and the catback system?

    Smitty554

    • There will be a subtle difference in tone. It depends on how keen your ear is. Either will be an improvement over the stock exhaust. Be prepared, the exhaust will be louder overstock, but will sound better which is probably what you want, but your neighbors may not. I would recommend checking out other Mustangs to see what different setups sound like. The exhaust tone is a personal preference. Everyone has a different idea of what they think is the right sound. As far as performance, there may be a slight increase in HP due to less exhaust restriction, but either does not require a tune. Most of the time the better exhaust sound (when you have your foot into it) makes you perceive that you have more power. You would feel the power increase with a set of long tube headers, but probably not too much with the aftermarket catbacks or axle backs. Hope this helps…. 2fast08

      2fast088

    Show 2 more answers Helpful (1)

    Is it possible to get everything listed here except the X-pipe? I want to run an H pipe with this.

    CA707

    • Yes, however, the overaxle pipes that are currently on the vehicle would have to be reused, we do offer the flowmaster outlaw series axleback system item 18445. https://www.americanmuscle.com/flowmaster-outlaw-axleback-13gt.html

      AMjordan

    Helpful (0)

    I am wanting to do a full exhaust with Long Tube Headers. Do any of the Long Tube Headers come close to being able to connect to the Flowmaster Cat-Back? I know most likely some modification would be needed to bridge the difference between the Cat-Back and the LTH.

    Pittmadj

    • Since the Flowmaster Outlaw Cat-Back Exhaust comes with the X-Pipe. It is likely that the long tube headers will require some cutting and welding to mount with the included X pipe. For a bolt on installation you will need to replace the included x pipe with a shorty x pipe that matches your headers.

      VincentV

    Helpful (0)

    Instead of receiving the scavenger x pipe can y'all replace it with an off road h pipe?

    HectorM

    • Hi, This Cat back is a pre-made kit from Flowmaster, no changes can be made to this kit.

      Chris J

    Helpful (0)

    I want to buy headers for my car, but would this cat back fit the kooks headers if i buy the catted x pipe and replace it for the scavenger x pipe?

    Anonymous

    • This catback system will be able to work with the Kooks headers and the catted shorty X-Pipe item #65504 as the pipe sizing is the same at 3" in diameter.

      KevinD92

    Helpful (0)

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    Customer Reviews (50) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Loudness / Volume 4.958333 5.0
    • Exhaust Note 4.916667 4.9
    • Fit & Finish 4.5625 4.6
    • Bang For Your Buck 4.875 4.9



    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      November 11, 2012

      LOOOOOOUD! BE AWARE!

      This system is ABSOLUTELY LOUD! I'm afraid to hit over 2k RPM in Koreatown, Los Angeles where I live. There are lots of cops out there. I have watched Outlaw axle-back in YouTube, but I haven't really watched Outlaw catback one there. I expected a little louder or higher tone than the axle back, but it was totally out of my expectation. A LOT OF LOUDNESS!! BE AWARE. The thing that you have to know before you order one. Yes, this system is very loud like ready-to-track one. Secondly, there is big big drone at 2000 RPM which range is cruising RPM in the highway. It may annoy your ears if you're not the type of person like a racer. Thirdly, it doesn't make sound in every single RPM. I can't explain it but it's like changing the sound in certain RPM, and it feels like there is no sound between the ranges(in the cockpit). So BE CAREFUL! I drifted the car during left turn and even in the straight line, and it wasn't my purpose because I couldn't hear the sound. For the performance, I haven't felt noticeable difference.

      LAkoreanGangstaMustang

      Year: 2013 Submodel: GT Los Angeles, CA, USA

      Helpful (9)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      January 16, 2013

      Best deal around, better than i expected.

      This is my 4th Mustang and I have used Flowmasters, Borla and Pypes in the past. I know the new 5.0 Coyote is a real animal and a good set of pipes would go a long way but this was even more than i could have hoped for. My last Stang was an 03 Mach 1 with the 4 valve 4.6. I had Borla and Flows on it I thought that sounded amazing until I started this bad boy up with the new Outlaws on it. At cold start it has a rumble like I have never heard from a street car, it will just slap a huge smile on your face. After a few seconds it mellows out a bit but it still has the deep rumble we all crave. Once you start driving you hear a mix of FORD V8 power and a strong race inspired growl. The most impressive thing for me is the fact that mine is an auto but you still get those aggressive downshift sounds you would get from a manual when you slow down or come to a stop. As far as performance, i never expect a lot from Flowmasters, i see them as the best sounding system and that's what i wanted but to my surprise I got the power also. This thing kicks my a** off the line now instead of that awkward smooth take off FORD created for us for some reason. I had a local shop do the instal for me because i don't have a lift and I didn't want to have to fight with the stock system under a car on jack stands. My install was only $150, can't beat that. I would highly, HIGHLY recommend this system to anybody that wants a very loud and aggressive ride. I feel like making constant left turns when i am driving this now. Thank you Flowmasters!

      Impact13GT

      Year: 2013 Submodel: GT Lake Worth, FL

      Helpful (7)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      August 19, 2013

      Very Loud, Annoyingly So At Times

      This was way louder than I expected it to be. I absolutely love the note and volume, and it definitely turns heads when you go by. I've had numerous people compliment me on it. The only downside is how loud it is inside the car. It's loud enough that conversation with someone can be quite tough at times. The drone at 2k RPM is borderline intolerable. You'd better have the Shaker audio system in your car to drown it out or you'll go insane. The interior noise from this system makes using the voice commands for SYNC damned near impossible. Interior noise seems to be less if the windows are down. (No help if you're going to be driving the car year round though.) I received the product faster than expected. The box was banged up upon receipt, but I suspect that was more the fault of UPS than that of American Muscle or Flowmaster. The black paint on the mufflers was scratched off in a couple of places when I opened the box, but it didn't concern me since it wasn't going to be visible anyway. Not sure whose fault that was. The exhaust tips were unmarred though, and there weren't any dents or other damage anywhere. I'd recommend this exhaust for track use or a pleasure vehicle you only take out once in awhile. I WOULD NOT recommend it for a daily driver, especially if you use the SYNC system or Bluetooth a lot.

      UnclePony

      Year: 2014 Submodel: GT Masontown, PA 15461, USA

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      November 11, 2012

      Great exhaust!

      The exhaust sounds great! It's nice and loud :) it does have a little drone around the 2k range. The install was a breeze everything fit perfect like it should!

      D3AD

      Year: 2013 Submodel: GT Mountain Home, ID 83647, USA

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      March 22, 2013

      Fantastic sound, couldn't be happier!

      This product is awesome, hands down. In my city of 120,000 people, the only cars that are louder and more aggressive sounding than mine cost well over 2 to 3 times more what my mustang did. The only issue really with it, is that it rattles things inside the car, such as my cup holder, that around 2000rpm makes this shaking sound. I had the instillation done in a shop, because unless you have a way to raise your car up, it can't be done at home. Instillation was $60 (I know people at the ford dealership, hence why it was so cheap) and it took about 2 hours. Overall, I love the sound, the rumble, and the bang for the buck!!

      Keylinator

      Year: 2013 Submodel: GT Abilene, TX

      Helpful (3)

    • 4/5

      Installation Time: Afternoon

      January 02, 2013

      sounds great at high rpm

      it to awhile getting the right side exhaust tip from touching my plastic.It kept on turning ,so i had to tack well it.The clamp was not working all that great.But the look,sound and price made up for it

      fastguy

      Year: 2013 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      July 03, 2014

      amazing exhaust!!!

      I have been looking at this exhaust for awhile. I wanted something a lot more aggressive and with a deeper note and this is it. So loud, so aggressive, well worth the money and I highly recommend it for anybody.

      joson87

      Year: 2014 Submodel: GT Chesapeake, VA, USA

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      June 02, 2013

      Very nice but very loud

      IF you want to turn heads buy this exhaust. They are extremely loud but sound awesome.

      Panamaraptor

      Year: 2014 Submodel: GT Anchorage, AK, USA

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      April 19, 2013

      If you want people to stop and take notice!!

      First off the BANG for your buck is outstanding. High quality , Great Fit, solid clean looking exhaust. Second is the sound... nothing will turn heads and get you complements more than this exhaust. Most people say it just sounds "Legit" "the real deal" Throaty full sound in Low RPM's and then straight up "Race Car" above 4000... There is some drone around 2k but it seems to very. 98% of the time I don't notice or care. It did get a bit louder after it broke in a bit.

      CaptinAhab

      Year: 2013 Submodel: GT Riverside, CA, USA

      Helpful (2)

    • 2/5

      Installation Time: Afternoon

      July 17, 2017

      Flowmasters growl!

      This exhaust is great. Turns heads everywhere I go! Sounds so good.

      DavidB

      Year: 2014 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      September 28, 2016

      LOUD!!:)

      This exhaust is LOUD! But I LOVE it! It sounds so mean! As soon as this beast was installed (I took my buddy and I about 1and30mins no lift need but it is a pain without one) it turns heads I mean when I say it turns heads it does turns heads! Aggressive all around! I highly recommend this exhaust!

      ElJefeFiveOh

      Year: 2013 Submodel: GT

      Helpful (1)

    • 5/5

      September 04, 2016

      Amazing sound

      This system is killer!! Great sound and sleek look. The pipes have a much better look than the stock pipes and mufflers. This system barks, pops but be aware it is very loud, just under most decibel limits. This system is great and with an intake and tune will transform your mustang.

      FirefighterPFR

      Year: 2013 Submodel: GT

      Helpful (1)

    • 3/5

      August 19, 2016

      Outlaws

      Man do these things sound mean!! They are super deep and sound really aggressive. But they do have a downside , the drone is horrible right at 2k rpms. I really do love the sound while cruising through town but when on the high way around 70-75 it's just horrible. If I would've knew I wouldn't go with this product

      Mustang2013

      Year: 2013 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      June 02, 2016

      Just what I expected

      After listening to the sound clips on the website I decided the Outlaw was what I wanted. It's definitely louder in person, but was just what I wanted. As an installation note, I would say you should have 2 extra OE exhaust clamps before starting, as the install requires that you reuse a pair, and I found mine to be nearly impossible to take off undamaged and usable. Other than that, very easy install. There is a drone to the exhaust at 2000 rpm, but it's worth the irritation, because this system sounds like an animal at higher revs. It is very loud, so you won't be sneaking up on anybody with this exhaust. Love the sound.

      Lucky13

      Year: 2013 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      July 31, 2015

      Wicked note, Awesomely loud, Holy cabin drone!...

      Well the title says it all...almost. First off installation was fairly simple, considering me and my buddy removed OEM and installed this exhaust in his driveway with jacks and stands. Took about 3 hours. Ended up cutting stock exhaust. Was immediately pleased with fit and look. It sounds like a mustang should sound aggressive and mean. Definitely a head turner. Only reason I didnt give it all five stars was due to the cabin drone. I have to shift into 5th gear and roll the windows down to use the Bluetooth calling and have fun trying to keep a normal conversation with the passenger. Other than that. I am very pleased.

      Hump

      Year: 2014 Submodel: GT El Paso, TX

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      August 23, 2014

      Freaking louder than loud

      This product is ABSOLUTELY LOUD. At the first cold start it rumbles like no other exhaust and does so at every cold start. At 2k rpm there is a slight drone but hey who cares. The tip somewhat touches the bumper but all you have to do is put your shoe inside the tip and yank it down and to the right a little. Installation was quick and easy and you can feel the performance difference this exhaust offers. This exhaust is great if your looking for the best sound and somewhat performance. I would recommend this to every mustang owner.

      Nimair786

      Year: 2014 Submodel: GT Richmond, TX, USA

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      April 07, 2014

      Very angry note!

      Very aggressive exhaust system. I love it personally!! I couldn't be anymore pleased with this product! Already have had several compliments and head turns! My father said it makes my automatic v8 sound like a manual when I let of the gas! Very pleased!!!

      Bluethunder13

      Year: 2013 Submodel: GT Martinsburg, WV, USA

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      March 28, 2013

      Easy install

      The hardest part about installing this product is the removal or the stock system. The stock h-pipe is shorter than the x-pipe in the kit, which makes the stock mid-pipe longer, requireing more clearance to remove if you don't want to cut it. Once the stock system is removed the install is easy and does not require near as much ground clearance. Even with slightly bigger pipes from stock there are no problems with the fit. Best of all, it makes the car sound like it should.

      Rob79

      Year: 2013 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      September 15, 2017

      So worth it!

      Cant even count how many ppl compliment how badass the car sounds

      ClaireM

      Year: 2013 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      September 01, 2017

      LOUDNESS IS 8 OUT OF 5 STARS

      If you are going to purchase this exhaust, really make sure you want the vehicle to ROAR, because it does just that. This sound WILL turn heads, including your neighbors. I already have all too much experience in waking them up, so if you live in a neighborhood where houses are tight fits, proceed with caution. 10/10 on the exhaust though, wouldn't change a thing about it. Flowmaster does it again!

      xJBiRDx

      Year: 2014 Submodel: GT

      Helpful (0)

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