1-888-332-7930 M-F 9-9 EST, Sat 9-5:30 EST

Free Shipping on Everything. Seriously. Details

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

30 Reviews
Our Price


  • Item #18444
  • MPN #817590
  • Market Price $895.99
  • You Save 10% ($88.99)
In Stock Ships same business day.
Free Shipping on Everything
Product Videos Customer Photos
  • 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
Super Aggressive Flowmaster Sound. Give your Coyote powered Mustang that unmistakable Flowmaster sound with the Outlaw Series Catback 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.

Stainless Steel Construction. Constructed from durable 3" diameter 16 gauge 409 stainless steel tubing for it's corrosion resistant properties the Flowmaster Outlaw Catback 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 Catback exhaust system is designed to fit the 2013-2014 5.0L Coyote Powered GT Mustang for both great looks and great sound. Does not fit Shelby GT500 models.

Mustang 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

Installation Time: (approx) 2 Hours

Difficulty Level:Advanced mechanical skills required.

Tech Specs
Axleback 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
  • Boss 302 - 13
  • GT - 13, 14

Most Helpful Reviews View All

Overall Rating 4.9/5 Write a Review

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) (0)

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 (6) (0)


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, View Full Transcript

Customer Photos (8) View All

You Might Also Like

Q & A (8 Questions, 7 Answers) Ask a Question

Catalytic converters? I personally didn't do the install, and don't know much about cats, but do these have a catalytic converter? I want to add a ghost tune and I have this exhaust plus a roush cold air intake.

Black2012Nightmare Year: 2012 Model: GT

Question Resolved
Good Question (0) (0)
  • Unless you took them off, the factory cats are still on your car. This system bolts up to them.

    Helpful (4) (0)

    Best Answer

    Branden03gt Year: 2013 Model: GT

    Top 250 Contributor

Show 1 more answer

Does this system delete the resonators on my 2014 GT?

Ronny Year: 2014 Model: GT

Question Resolved
Good Question (0) (0)
  • Yes It retains the cat down pipes though. But still very loud. That's a good loud though!!!

    Helpful (0) (0)

    CMR81 Year: 2014 Model: GT

Show 1 more answer

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

Smitty554 Year: 2013 Model: GT

Question Resolved
Good Question (1) (0)
  • 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

    Helpful (1) (0)

    Best Answer

    2fast088 Year: 2008 Model: GT

Show 2 more answers

Reviews (30) Write a Review

  • 5 Stars .93 93%
  • 4 Stars .07 7%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars 0 0%

out of 5 stars

30 Customers Recommend this Product

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume: 4.933333 4.9/5
  • Exhaust Note: 4.9 4.9/5
  • Fit & Finish: 4.5 4.5/5
  • Bang For Your Buck: 4.833333 4.8/5
Filter By Sort By
  • 5/5


    November 11, 2012

    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.


    Year: 2013 Model: GT Driving Style: Race 'Stangs I have owned: 1 Los Angeles, CA, USA

    Helpful (9) (0)

  • 5/5

    Best deal around, better than i expected.

    January 16, 2013

    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!


    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 4 Lake Worth, FL

    Helpful (6) (0)

  • 4/5

    Very Loud, Annoyingly So At Times

    August 19, 2013

    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.


    Year: 2014 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Masontown, PA 15461, USA

    Helpful (4) (0)

  • 4/5

    sounds great at high rpm

    January 02, 2013

    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


    Year: 2013 Model: GT Driving Style: Street / Strip

    Helpful (3) (0)

  • 5/5

    Great exhaust!

    November 11, 2012

    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!


    Year: 2013 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Mountain Home, ID 83647, USA

    Helpful (3) (0)

  • 5/5

    amazing exhaust!!!

    July 03, 2014

    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.


    Year: 2014 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Chesapeake, VA, USA

    Helpful (2) (0)

  • 5/5

    If you want people to stop and take notice!!

    April 19, 2013

    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.


    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 10+ Riverside, CA, USA

    Helpful (2) (0)

  • 5/5

    Fantastic sound, couldn't be happier!

    March 22, 2013

    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!!


    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Abilene, TX

    Helpful (2) (0)

  • 5/5

    Very nice but very loud

    June 02, 2013

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


    Year: 2014 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Anchorage, AK, USA

    Helpful (1) (0)

  • 5/5

    Easy install

    March 28, 2013

    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.


    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2

    Helpful (1) (1)

More Products You Might Like

Related Categories