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2005-2009 Mustang Axle-Back Exhaust
Flowmaster Outlaw Series Axle-Back Exhaust (05-10 GT, GT500)

Flowmaster Outlaw Series Axle-Back Exhaust (05-10 GT, GT500)

100+ Reviews 21 Answers

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Item 18423
MPN# 817511

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Flowmaster Outlaw Series Axle-Back Exhaust (05-10 GT, GT500)

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Features, Video & Details

Super Aggressive Flowmaster Outlaw Sound
Durable 409 Stainless Steel Construction
2.5" Mandrel-Bent Tubing
4" Polished Stainless Steel Tips
Includes Two Flowmaster Outlaw Mufflers
Fits 2005-2010 GT, Bullitt, and Shelby GT500

Product Resources

Customer Photos (78) Customer Reviews (100+) Questions (45) & Answers (21)

Review & Installation Video

Review & Install Video

Hey everyone I’m Justin with AmericanMuscle.com, and today we’re going to be breaking down the Outlaw series Axle-back from Flowmaster for the 2005-2010 Mustang GT. Flowmaster calls this their most aggressive Axle-back system available for the late model 46 Mustangs. This entire kit centers around these two outlaw series mufflers, which to the casual observer, hardly resemble mufflers at all, but rather highly engineered resonant tubes, which are responsible for that super aggressive tone. Like many other Flowmaster kits the Outlaw series features 409 grade steel construction and 2.5” mandrel bent tubing. It also features this very sleek black finish, which is going to be great at resisting corrosion. Everything exits out of these dual 4” polished tips, embossed with that classic Flowmaster logo. Installation of this Axle-back is very straight forward and should only take you about an hour using some basic hand tools. Now let’s hear how the Outlaw series from Flowmaster sounds compared to your factory exhaust.

Super Aggressive Flowmaster Sound. Give your 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.

Quality Construction. Constructed from durable 2.5" 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 2005 to 2010 GT, Bullitt and the 2007-2010 Shelby GT500 Mustangs for both great looks and great sound.

Technical Note: Americanmuscle recommends adding the 2005+ Mustang 304 Stainless Steel Exhaust Hanger Kit from the drop down option above, to provide more strength, stability and a cleaner installed appearance. If you have a 2007 Mustang you may need the kit for correct installation.

Fitment: 2005 2006 2007 2008 2009 2010 Details

What's in the Box

(2) Muffler assemblies
(2) Clamps

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 2005-2010 Mustang

Customer Submitted:
How to Install MAC Boom Tube Axle-Back Exhaust on your 2005-2010 GT and GT500

Tech Specs

Axle-Back Exhaust Specifications

Piping Material:	409 Stainless Steel	Tip Material :	Polished Stainless Steel
Piping Size:	2.5"	Tip Size:	4.0"
Muffler Type:	Straight-through	Fitment:	2005-2010 GT, Bullitt and Shelby GT500

Tech Guides:

Will it fit my Mustang?

Bullitt - 08, 09
GT - 05, 06, 07, 08, 09, 10
GT500 - 07, 08, 09, 10

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Customer Photos (78) Submit Your Photo

View All 78 Photos

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Questions & Answers (45)

5 Top Rated Questions

SLPLOUNDMOUTH OR FLOWMASTER OUTLAWS DID HE HAVE A BIG DIFFERENCE BETTEWN THE SLP LOUNDMOUTH AND THE OUTLAW. THE FLOWMASTER OUTLAW IS IT REALLY LESS LOUND THAN SLP LOUNDMOUTH I HAVE A GT 2005, AND I REALLY DONT KNOW WITCH ONE BUY. WHICH ONE IS GONNA BE THE BEST FOR SOUND AND PERFORMANCE. WITCH PART I COULD JOIN TO THE OUTLAW FOR INCREASE SOUND AND PERFORMANCE THANKS

Outlaw is plenty loud all by itself. If you want to amp it up try some long tube headers paired with an h pipe. But trust me they're good all by themselves
all muffler deletes are loud, hence no muffler. the Outlaw is quieter than other deletes on cold start ups and they roar at WOT
outlaws for sure. youll be happy. they have a different, own style sound, unlike any I have heard but are impressive even at high rpm's. sound dont disappear as you step on the gas, very little drone at all.sounds NASTY
I purchased the outlaws, I had stock mufflers before. They are loud and sound amazing and I picked up from 14.07 to a 13.81

Helpful (9) Show 3 more answers

How do these sound on a V6 with true dual? Do you have a sound clip available?? I removed the X brand because of cabin drone... will these create a drone on the V6? Thanks

I have sound clips of a 2009 V6 with the ford racing dual exhaust that uses a true dual setup and the same mufflers as the bullett mustang, and the Flowmaster Outlaw. The Outlaw provides a much deeper throat tone to the exhaust making it more like a V8 sound. It has a little bit of drone at certain RPM's however it really gives the V6 a muscle car sound. The closest thing I can relate it to is the new Boss 302 Laguna Seca. IT SOUNDS AWESOME!!!!
http://www.youtube.com/watch?v=eVne5HYVIqw&feature=youtu.be Hopefully that link works. The video is called "2009 Mustang V6 dual exhaust sound clips"
very slite drone,unlike the classic's but sound NASTY. I mean NASTY. totally different sound I have heard. youll love em

Helpful (5) Show 2 more answers

I have a 2005 Shelby GT500...will these work?

This Flowmaster Outlaw Series Axle-Back Exhaust will not fit a 2005 Mustang GT500.

Helpful (1)

I have the Pypes muffler deletes on my 05. Are these Flowmaster Outlaw axle back louder and have a deeper sound than the Pypes muffler delete's? Cant really hear the difference between the video's

The Pypes Muffler-Delete Axle-Back Exhaust (05-10 GT, GT500), item # 20022, (http://www.americanmuscle.com/pypes-2005-gt-muffler-delete-axel-back.html) may have a slightly higher pitched sound than the Flowmaster Outlaw Series Axle-Back Exhaust, The Flowmaster's are going to have a very deep sound that is also loud. It also depends on what other exhaust mods you have made. Different headers and mid pipe will drastically change the sound of the car as well.

Helpful (1)

Do the Flowmaster Outlaw series Axle-Back Exhaust add horse power to your Mustang.

That is a big yes and they sound real good and meaty.
No they do not add horse power to your car, just changes the sound.
Over stock? Yes. Anytime you install more free-flowing muffler, you will unlock more horsepower.

Helpful (1) Show 2 more answers

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

10 More Questions

Hello again, I have a 2005 Shelby GT500 and I am looking for some aggressive axle back pipes but I can't seem to find any that will work on her...any suggestions? I would like something similar to the flowmaster outlaws. Thank you. 0 answer

Do i need to re tune my car after adding these? 2010 Mustang GT. 4.6L V8. 1 answer

No, a tune would not be required for a new axle-back exhaust.

Helpful (0)

Would this Axle-Back pass New Jersey state inspection? No other modifications are done to the exhaust yet. 1 answer

This axle-back exhaust should pass the state inspection without any issues. However, we do highly recommend that you contact a local shop to confirm what modifications will and won't pass your state inspection as it can vary.

Helpful (0)

Will these get me pulled over for being too loud? 1 answer

The Flowmaster outlaws are definitely one of the louder exhausts offered. It would honestly depend on your state though and the vehicle laws. We generally recommend checking with your local or state ordinances to confirm.

Helpful (0)

Will the Flowmaster Outlaw Exhaust pass Pennsylvania state inspection? 1 answer

The Flowmaster Outlaw Series Axle-Back Exhaust will be legal in all states for inspection.

Helpful (0)

will these outlaw exhaust pipes pass smog 1 answer

We suggest checking with your local authorities to see if the Flowmaster Outlaw Series Axle-Back Exhaust is legal in your area.

Helpful (0)

I'm interested in purchasing this Exhaust set with an X pipe. I currently have a 2011 v6 with a stock dual exhaust, by chance would these fit? 1 answer

The Flowmaster Outlaw Series Axle-Back Exhaust are specifically designed for the 05-10 GT and 07-10 GT500s.

Helpful (0)

I have Duel exhaust on my 2008 V6 mustang, can I put GT axle-back exhaust on it ? 1 answer

Yes the Flowmaster Outlaw Series Axle-Back Exhaust will fit your 2008 V6 with a true dual exhaust conversion.

Helpful (0)

Hey does these exhaust come with black tip? 1 answer

We currently do not have the Flowmaster Outlaw Series Axle-Back Exhaust with the black tips no.

Helpful (0)

Will these fit my 05 v6 mustang? Really want to get these but not sure if it’ll fit them 1 answer

This Flowmaster Outlaw Series Axle-Back Exhaust will not work on your 05' V6 Mustang. This exhaust is only intended for use with the 05'-10' Mustang GT's and GT500's.

Helpful (0)

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Customer Reviews (100+) Write a Review

Overall Rating

4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

Loudness / Volume 4.81155 4.8
Exhaust Note 4.87234 4.9
Fit & Finish 4.607903 4.6
Bang For Your Buck 4.759146 4.8

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

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5/5

Installation Time: Less than 1 Hour

July 09, 2018

LOUD

install is very straight forward, unbolt old mufflers, bolt on new ones. Exhuast is very loud and has a nice throaty tone. I replaced my Flowmaster American Thunder mufflers with these and the sound is similar, but these are much louder.

BigRob06

Year: 2006 Submodel: GT

Helpful (0) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5
July 09, 2018

Axel back

I was looking for the sound my mustang deserves, this was perfect. Neighbors will hate me but who cares.

Kelly

Year: 2006 Submodel: GT

Helpful (0) 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: $100-$250

June 25, 2018

obnoxious

love them such a great sound. now with 3 loud cars to irritate my neighbor especially first thing in the morning in the garage. would highly recommend these to any mustang owner

SteveH

Year: 2006 Submodel: GT

Helpful (0) 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 22, 2018

Great exhaust

Great sounding exhaust. Great sound with minimal drone. Install was easy and straight forward. Love the sound.

TylerM

Year: 2010 Submodel: GT

Helpful (1) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

May 28, 2018

Head Turner

The video does not do it justice. It sounds so much better in person. It has a really nice deep rumble and it’s very loud and cold start is even louder. Turns heads wherever you go definitely worth it.

Jenni

Year: 2006 Submodel: GT

Helpful (3) 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: Afternoon

May 27, 2018

V6 stang

Had the V6 Pypes dual conversion on before. This was an easy fit and works great. The sound is a deeper and sound a little louder. Took about 3 hrs due to having a hidden hitch and had to remove pipe near transmission first. But without the hitch it would have taken about 2 hours.

Tomw2005

Year: 2005 Submodel: V6

Helpful (3) 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

May 24, 2018

loud

Very happy with this exhaust would tell all on how great this product is

jd

Year: 2005 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

May 24, 2018

Best sound!!!!

It's roars on 1st-4th gears then when it hits 5th it growls all the way

NathanielL

Year: 2005 Submodel: GT

Helpful (2) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 4
  4
- Bang for your Buck 3
  3
5/5

Installation Time: Afternoon

May 11, 2018

What a difference over factory’s stock mufflers

This exhaust are definitely a head changer and are easy to install just a few awkward spots getting the hangers down but it was worth the hassled and them Polish give this aggressive exhaust a nice finish definitely would consider every mustang person to take a look at these!

AdamR

Year: 2007 Submodel: GT

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

Installation Time: Less than 1 Hour

May 03, 2018

Fantastic Flowmasters

I enjoy driving my GT500, but the factory exhaust really left me feeling like something was missing. After researching so many different manufacturers and parts options, I decided to buy the Flowmaster Outlaw Series Axle-Back exhaust. After all, it has great reviews, a superb reputation of quality, and the price was just right. A couple of days later, the mufflers arrived and with the excitement of a kid at Christmas, I tore open the box. I was not disappointed to say the least. The workmanship and quality put into this exhaust is evident in the materials used, expert welding, and even the black finish with shiny tips featuring the Flowmaster logo. It took me about an hour to pop off my factory exhaust, and install the Flowmaster Outlaws. The prewelded brackets fit easily and securely into my factory hangers... I was lucky enough to have an '07 with the right hangers, and not need to purchase new ones. So I tightened everything up, and fired up the engine. Let me say this.... even with factory cats, it was amazing. It was that perfect spot between not loud enough and too loud. The Flowmaster Outlaws are perfect for an aggressive but not overwhelming sound that every muscle car enthusiast loves to hear. Everything about this axle-back exhaust was great, from start to finish, and I am absolutely in love with it still after almost a month. 10/10 recommend if you want a head-turning, aggressive growl for your hot rod, the Flowmaster Outlaws are what you need.

DannyB

Year: 2007 Submodel: GT500

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

Installation Time: Less than 1 Hour

April 29, 2018

Outlaws

At 3,000rpm and above with longtube headers and a catless x-pipe you will shatter eardrums!!!! The fit isnt very good..does not fit into stock hangers on the car. But if you are looking for wide open design and quality these are for you

08InfantryGT

Year: 2008 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

April 25, 2018

Best prouduct alive.

Best exhaust pipes out right now. Turned my gt into a beast.

ShawnL

Year: 2006 Submodel: GT

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

Installation Time: Shop Install

Installation Cost: $250-$500

April 20, 2018

Omg love these!!

Sound is amazing! Pretty loud for a v6! Nice and deep when combined with CAT delete and an X-Pipe or H-Pipe.

Jordan

Year: 2005 Submodel: V6

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
April 14, 2018

Lound and tunder

Great exaust they sound so good really happy with theis product

RomanF

Year: 2010 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

April 11, 2018

Freaking awesome !!

Brought the car to life. Awesome deep throaty sound. Sounds amazing

MichaelM

Year: 2010 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: Shop Install

Installation Cost: $250-$500

April 09, 2018

Stormtrooper V6

I got a 2007 mustang v6, with this product it sounds better then what most would think it would. The guys at the shop was amazed when they first started it up. The outlaws are a way to go with a v6 or a V8. My system is loider then my buddy's 2007 mustang GT with the borla ataks.

DylanE

Year: 2007 Submodel: V6

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

April 03, 2018

Great Exhaust

One of the best Exhaust I have had for that price is the best

MathewK

Year: 2006 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

March 25, 2018

Flowmaster Outlaw

This axle-back exhaust sounds absolutely fantastic! For just being an axle-back, it is very loud. If you are planning on adding x-pipes to this, be prepared for your neighbors to hate your car

HunterW

Year: 2009 Submodel: GT

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

Installation Time: Less than 1 Hour

March 24, 2018

Great bang for your buck

The outlaws are a bit on the expensive side but when you install them and start driving you will forget about the 500 bucks you just dropped and smile ear to ear. The stock gt exhaust is trash, everyone knows that. The outlaw system brings out a loud growl from your v8 with minimal droning at highway speeds and is an easy install with a proper lift. Very happy with this purchase.

Jordan

Year: 2010 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

March 19, 2018

Simply the BEST!!!!

Second time around with these Outlaws......a pair for my '06 and '07. Easy as Plug and Play. No better sound out there!!

Broakie56

Year: 2006 Submodel: GT

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

Flowmaster Outlaw Series Axle-Back Exhaust (05-10 GT, GT500)

Buy Together

$457.48

+$49.99