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2010-2014 Mustang Axle-Back Exhaust
Flowmaster Outlaw Axle-Back Exhaust (13-14 GT)

Flowmaster Outlaw Axle-Back Exhaust (13-14 GT)

100+ Reviews 18 Answers

Market Price $516.99 You Save 12% ($59.51)

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$457.48

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Item 18445
MPN# 817592

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Flowmaster Outlaw Axle-Back Exhaust (13-14 GT)

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Features, Video & Details

Super Aggressive Flowmaster Outlaw Sound
Durable 409 Stainless Steel Construction
2.75" Mandrel-Bent Tubing
4" Polished Stainless Steel Tips
Flowmaster Outlaw Mufflers
Fits 2013-2014 GT and Boss Mustangs

Product Resources

Customer Photos (29) Customer Reviews (100+) Questions (18) & Answers (18)

Review & Installation Video

Review & Install Video

Hey I'm Justin with AmericanMuscle.com, and this is my brief look into the Flowmaster Outlaw series axle back, fitting all 2013 Mustang GTs, and GT500's. If you're looking for a system that will really allow your 5.0 or 5.8L to be heard, then this is it, Flowmaster calls this their most aggressive axle back available for the new V8's, thanks to the two Outlaw series straight through mufflers, that should really help uncork the exhaust flow. Like many other Flowmaster exhaust, the Outlaw series is constructed using durable 409 grade stainless steel, and does feature 2.5" mandrel bent tubing. The exhaust is also finished off in that sleek black finish, which is great at resisting corrosion. Finally, everything exits out these dual 4" tips embossed with that iconic Flowmaster logo. Installation on this axle back is very straightforward and should only take you about an hour in the driveway using basic hand tools. Now let's hear how Flowmaster's Outlaw series axle back sounds compared to our factory exhaust.

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 2013-2014 GT and BOSS Mustangs for both great looks and great sound. Reuses the factory clamps for installation.

Fitment: 2013 2014 Details

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

What's in the Box

(2) Muffler assemblies

Installation Info

Installation Time: (approx) 1 Hour

Difficulty Level:Light to Moderate mechanical skill required.

Installation Guides:

Manufacturer:
How to install a Flowmaster Outlaw Series Axle-Back Exhaust on your 2011-2012 Mustang

Customer Submitted:
How to Install an Axleback Exhaust on your 2011-2012 Mustang GT

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:	2013-2014 GT, BOSS

Tech Guides:

Will it fit my Mustang?

Boss 302 - 13
GT - 13, 14

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Customer Photos (29) Submit Your Photo

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Questions & Answers (18)

5 Top Rated Questions

What do I need to be able to put these on my 2014 V6?

Unfortunately, this Flowmaster Outlaw Series Axle-Back Exhaust is specifically designed for use on 13-14 GT model Mustangs and would not fit properly on 13-14 V6 model Mustangs.

Helpful (1)

Will these fit on 2012?

Fitment is slightly different on the 13-14 GT models. For the 11-12 GT, you would want this set: https://www.americanmuscle.com/flowmaster-outlaw-axleback-1112gt.html.

Helpful (0)

Are they legal in California

The Flowmaster Outlaw Series Axle-Back Exhaust will be CARB approved yes.

Helpful (0)

Do this come with dual tip, so it can go with my GT500 valance ?

We do not have a quad tip option for this exhaust. Yes it would fit your valance.

Helpful (0)

I have a 2010 v6mustang I know the piping is 2.5 with stock but can I get a bigger pipe as well so it fits the 2.75 cause these sound so amazing and I really want to run them

Yes you are able to fabricate the exhaust to work together if you do not mind doing a little custom work, however as a heads up these will not sound the same on your V6 as they do on a Mustang GT.

Helpful (0)

Not finding an answer? Ask your question! Post Your Question

10 More Questions

Hi. In the customer reviews there are a lot of comments about the droning sound at approx 2000 revs. Do you have any recommendations to prevent / limit this? I am keen to buy this product but cautious about the droning. 1 answer

Hey Frank, As far as the outlaw system goes there is really no way to avoid the droning. this system is supposed to be as loud as loud gets. If you are looking for that same exhaust note but maybe not as loud i would look at the Flow master Pro series (18459). That system has the same design with a little more restriction in the resonator to produce a tone not as loud as the outlaw which is more of a straight through design.

Helpful (0)

I am installing the Flowmaster axle back on my 2013 GT will this increase my horsepower 1 answer

Unfortunately the Flowmaster Outlaw Series Axle-Back Exhaust will not add any additional horse power to the vehicle. This exhaust will allow the car to breathe easier making acceleration easier and throttle response.

Helpful (0)

Will these bolt up to a pypes catback exhaust 3in tubing? I would like to replace my pypes axleback mufflers for something louder and I'm wondering if these will bolt right up or would I need some adjustment to be done? 1 answer

Hello! The Flowmaster Outlaw Series Axle-Back Exhaust will not bolt right up to the Pypes 3 in Tubing. They are designed to mount up with the factory exhaust and will likely require some modification to work with your Pypes Cat Back

Helpful (0)

Why are clamps not included in this kit? 1 answer

The factory axle-back already has a clamp, and these Flowmaster Outlaw Series Axle-Back Exhaust will re-use those clamps since they are the same style clamp.

Helpful (0)

I have a 2012 gt will it still fit because it says (13-14 gt)before i buy? 1 answer

You will need the Flowmaster Outlaw Series Axle-Back Exhaust (11-12 GT, 11-12 GT500), item # 18422, (http://www.americanmuscle.com/flowmaster-outlaw-axleback-1112gt.html) for your 2012 GT.

Helpful (0)

By any chance could this exhaust fit my 2014 v6 mustang? 1 answer

Hi, This axle back will not fit on a V6 Mustang because the GT uses larger connection piping than the stock V6.

Helpful (0)

Does this fit well with my mustang GT/CS 2014? 1 answer

Yes all though it will depend on how loud you want your exhaust to be, fitment should not be a problem, I had the same exhaust on my 2012 Boss Mustang a long with my side exit exhaust that came with the Boss ( no spacers in my side exhaust as well ) and the car was load very load, I also had the MRT H-Pipe with free flowing cats, all I can say is it sounded great but it was load. So if you like it load and free flowing go for it the Flowmaster Outlaw axle backs are great.

Helpful (0)

Could these fit on a 2014 V6 Mustang? 1 answer

The Flowmaster Outlaw Series Axle-Back Exhaust (13-14 GT) will not be able to fit a 2014 V6 Mustang because the piping size for V6's are 2.5" whereas the Flowmaster Outlaw Series Axle-Back Exhaust piping size is 2.75".

Helpful (0)

fitment to aftermarket x pipe new to exhausts but will this fit a 3 inch offroad x pipe? it says this is 2.75 inch so im curious if this will fit. 1 answer

The Flowmaster Outlaw Series Axle-Back Exhaust connects to the stock cat-back, which is connected the the x-pipe, so this will not directly attach a x/h-pipe as there is a section of exhaust between the x/h-pipe and the axle back system. As long as the section of exhaust after the x/h-pipe is 2.75" in diameter, these axle backs will fit like a glove.

Helpful (0)

Highway driving How loud are these while cruising? 4 answers

They will be significantly louder than stock but definitely nothing too unbearable. It will sound like a nice mustang going down the highway, not anything too ridiculous.
It all depends on you RPM in the vehicle. Around 2200 RPM in 6th it tends to drone a bit however I just speed up or slow down a little. They have a nice deep rumble when you get on it.
They are loud while cruising at any speeds they take a little getting used too but once you get used to the sound it is very fun to drive with the sound.
Bought these for my dads boss 302 ls. And they sound amazing. Loud when you want them to be. There is small drone on 6th but there comfortable for cruising. If you keep it on 5th or 6th with light foot there not loud. But if you stomp it.... Oh yes!! Best axle backs in my opinion for price.

Helpful (0) Show 3 more answers

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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 4.781065 4.8
Exhaust Note 4.804734 4.8
Fit & Finish 4.745562 4.7
Bang For Your Buck 4.700599 4.7

no one in the world ever gets what they want, and that is beautiful

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5/5

Installation Time: Shop Install

Installation Cost: $100-$250

November 18, 2018

What a purchase!

I just installed them and I have to tell you no video do them justice, they are awesome, the car sounds so powerfull. If you own a mustang GT and don’t have the flowmaster exhausts installed you are missing out! Worth every penny!!

KACO

Year: 2013 Submodel: GT

Helpful (2) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

November 06, 2018

My Outlaw Exhaust

Omg The best thing I have invested into , My 2013 GT was stock and I went on YouTube listen to all exhaust , I knew I did Not have a lot of money to put into the Exhaust. But when my son told me to go listen to the Flowmaster Outlaw he new I would Love the Sound. And he was Right. I Love the Sound . It’s unbelievable and sounds like a Beast. Every where I go every Muscle Car guy is just Staring and keep Staring , I LOVE THE SOUND OF MY 2013 GT. ❤️

AngeliaM

Year: 2013 Submodel: GT

Helpful (3) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5
October 22, 2018

So Worth It

They Sound Soo Loud , I Love Them I Get Compliments Everywhere I Gooo....... Totally Recomend Them

EdwinD

Year: 2014 Submodel: GT

Helpful (2) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 4
  4
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

October 20, 2018

great sound

Love the deep growl. its loud but not disturbingly loud. and the crackle just makes it even more to love!.

1JarvisNorman

Year: 2014 Submodel: GT

Helpful (3) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 4
  4
- Fit & Finish 4
  4
- Bang for your Buck 5
  5
4/5

Installation Time: Less than 1 Hour

August 27, 2018

Great !

The description the magazine describes these pipes are spot on. Fast delivery ! Good quality stuff !

BrianK

Year: 2014 Submodel: GT

Helpful (4) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

August 02, 2018

Awesome sounding!!

These axle back's are awesome. I'm old school, I love me a loud exhaust with tons of drone. The exhaust note is perfect at 2K and above rpm.

Coyote2014

Year: 2014 Submodel: GT

Helpful (4) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

July 21, 2018

Great sound

Very agreasive sound. Alot louder than I expected. There is some drone at 3k - 3.5k rpm if your doing 70-80 just drop it in 5th to avoid the drone. Overall I couldn't be happier

NicholasS

Year: 2014 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

July 19, 2018

Great!

I love them. They give off the loudness and tone I was looking for. There is a slight drone around 2000 rpms, but you get used to it.

ShaneBeecham

Year: 2014 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

June 14, 2018

These Outlaws are going to make me an outlaw

My car is sickeningly loud now! I love drone and I get plenty of it. I've installed Flowmasters on each of my last 3 Mustangs and they never disappoint. I'm going to get thrown in jail for noise pollution one day!

JLJenkins

Year: 2014 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

June 06, 2018

These are awesome!

Just installed these on my 2014 GT. They sound terrific! If you are looking to upgrade your stock exhaust I highly recommend the Flowmaster Outlaw Axle-back. My neighbors do not need to set their alarm clocks in the morning anymore. The sound when you start up is awesome not to mention when you give your GT a little gas.

Chonce21

Year: 2014 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

May 29, 2018

So mean

Hey all, I installed these the day after I brought my 13 GT home and let me tell you... it woke up the sound of that 5 liter V8 so much! And for such an easy install it really increased the volume of sound and presence! Almost as loud with just mufflers as my 98 gt was with headers, OR x pipe and flowmaster 40 series! Worth every penny!

BrendanR

Year: 2013 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

May 27, 2018

Flowmaster Outlaw Series

Drone at around 2k but sitting idle it has a good deep growl and once you break 2krpm it wakes the neighbors up.

ConnerH

Year: 2013 Submodel: GT

Helpful (4) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

May 01, 2018

2013 mustang gt

great product east to put on sounds great every thing fit perfect everybody loves how it sounds

Bill

Year: 2013 Submodel: GT

Helpful (6) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

May 01, 2018

Flowmaster Outlaws

If you want LOUD this is the exhaust for you ! Good fit and quality made.

SnkeBte

Year: 2014 Submodel: GT

Helpful (6) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 4
  4
5/5

Installation Time: Less than 1 Hour

April 25, 2018

Flow master yeah

Man this exhaust just sets the tone of the car off and it’s ten times louder

BigD

Year: 2014 Submodel: GT

Helpful (6) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Shop Install

April 03, 2018

Outlaw

Very good product. Mellow at idle and aggressive when you hammer the car.

IrmaB

Year: 2014 Submodel: GT

Helpful (6) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

April 01, 2018

Sounds great.

Couldn't find an exact installation video, but as easy as this is to install it's not exactly needed. Hardest part is getting the stock mufflers off. All in all, done in a drive way with a jack and jackstands took about two hours with hand tools. Sounds great, makes every cold start, underpass, and heavy pulls worth it. Not so loud the neighbors will be complaining, but loud enough that you'll break necks. Slight drone around cruising speeds, enough that it's noticeable, but if you're worried about drone you shouldn't be touching your exhaust anyways. Sounds way better than Roush's Axle Backs in person.

BlueScout

Year: 2014 Submodel: GT

Helpful (6) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Shop Install

Installation Cost: 0-$100

March 30, 2018

Rumble coyote rumble

These are awesome!! Deep rumble at lower rpms and screams when you open her up. I giggled like a child when i started the car after installing these. Others complained about the drone but I don’t think they’re bad at all. There’s a little between 60-70 mph in 6th gear cruising but not as bad as others described. Highly recommend to all.

BJeffs

Year: 2014 Submodel: GT

Helpful (6) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

March 21, 2018

Deep sound

One of the best sounds you can have for your coyote.

DeeM

Year: 2014 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 4
  4
5/5

Installation Time: Less than 1 Hour

March 02, 2018

Love the sound

I waited over 5 years till my baby was mine and now she sounds as mean as she looks love the Flowmaster Outlaw axle back Mufflers they sound great this is just the beginning to the mods I'm going to do to my baby

MartinC

Year: 2013 Submodel: GT

Helpful (9) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5

Flowmaster Outlaw Axle-Back Exhaust (13-14 GT)

Buy Together

$457.48

+$9.99

+$399.00

+$363.99