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

Market Price $707.99 You Save 13% ($93.02)
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$614.97 (each)

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  • Item 393798
  • MPN# 817515

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    Features, Video & Details

    • Outlaw Series Cat-Back
    • Constructed from 409 Stainless Steel
    • Fully Mandrel Bent 2.5” Tubing
    • Two Outlaw Black Mufflers
    • 4" Polished 304 Stainless Steel Tips
    • All Clamps and Brackets Included
    • Fits 2005-2010 GT and GT500 Mustangs

    Review & Installation Video

    Review & Install Video

    You should check out the Flowmaster Outlaw cat-back if you're looking for a budget-friendly, stainless steel cat-back that's going to be loud. The cat-back features the Outlaw mufflers, which are known to deliver on sound, and they're some of the most affordable on the site at this time. When it comes to the install, you can expect this to take [you] an hour or two, and it's going to be a one out of three wrenches on the difficulty meter. Sound is going to be one of the most important things here when it comes to this system, and the Outlaw mufflers are race-oriented mufflers that are more resonator tubes than actual mufflers. These produce a sound that has a low decibel, but it rumbles and has a good amount of volume to it. Even though these are race-style mufflers, Flowmaster does tune the mufflers, so you're not just going to get a ton of noise. The tuned sound means that you'll get a good, controlled sound on the outside of the car, and little to no drone in the interior, which will be nice for those daily drivers. This cat-back doesn't produce a high-pitched raspy sound. It does have some popping on the decel note, so you're not looking at a flat sound. Overall, I'd rate this cat-back as a four out of five on the loudness scale, with one being a quiet upgrade and five being a very loud upgrade. Now, just make sure you keep in mind that if you ever change your headers or your mid-pipe down the road, this could open up even more noise for you. As far as materials, you're looking at 409 stainless steel for the majority of this system here, and 304 stainless steel tips. The fact that the tips are stainless steel means that they're going to keep that nice polished look to them, even over time. The entire cat-back is mandrel-bent, and it's two and a half-inch most of the way. So it'll bolt right up to your factory mid-pipe. The mufflers, which are coated black, have a three-inch diameter, and the tips are four-inch. Price-wise, you can expect to pay just over the $600 mark for this cat-back. This isn't the least expensive option out there, but it is one of the most affordable, especially when it comes to stainless steel options. If you're really on a budget, though, Pypes does make the Pype Bomb Super System, that's loud like this cat-back is, for about $50 less. This is a direct bolt-on item, so you're looking at a very easy install. I'm going to call this a one out of three wrenches on the scale when we look at difficulty. Overall, you're looking at about one hour to get this all done. A lift would certainly make things easier for you here, but the job can be done on jack stands as well, if you don't have access to one. All that you're really going to need is a socket set when it comes to tools. This cat-back will come with new hangers and all new clamps for you, so no need to transfer over anything from your stock exhaust. The whole cat-back can be dropped as one big piece, so an extra set of hands can really help here. When you go to install your new setup, it very simply bolts right up into the stock location, so you won't have to cut or modify anything. It'll probably be easiest to leave everything loose until you have it all lined up, and then tighten it down. That's going to be it for the Flowmaster Outlaw cat-back exhaust, fitting the 2005 through 2010 GT and GT500. But you can check it out more online right here at

    Look Great and Sound Great. Your 2005-2010 GT or 2007-2009 GT500 looks great rolling down the street. But if you're not getting that legendary Mustang rumble to go along with those great looks, here's the answer. The Flowmaster Outlaw Cat-Back Exhaust System provides that incredible, low decibel rumble that makes Mustang owners and admirers so loyal. To top it off, the 4” diameter polished stainless steel tips makes your Pony look as powerful as it feels when you're out enjoying the ride or just taking a quick peek while she's waiting in the garage.

    Specifications. The Outlaw Cat-Back Exhaust features 2.5” diameter, mandrel bent tubing constructed from race proven, 409 stainless steel. This Cat-Back is finished off with two black outlaw style mufflers and two 4” polished stainless steel tips embossed with the Flowmaster Logo. All Flowmaster exhaust systems are tuned to make sure the sound is great both outside and inside your ride.

    Installation. The Cat-Back Exhaust System comes with all clamps and hangers for a complete upgrade from your factory cat-back. This Flowmaster system uses factory mount locations, making installation very straight forward. The kit is covered by Flowmaster's Lifetime Warranty to make this upgrade an easy decision.

    Application. This Flowmaster Outlaw Cat-Back Exhaust is specifically designed to fit 2005-2010 GT, Bullitt and GT500 Mustangs equipped with the 4.6L and 5.4L engines.

    Fitment: 2005 2006 2007 2008 2009 2010 Details

    What's in the Box
    • (1) Right Muffler Assembly
    • (1) Left Muffler Assembly
    • (1) Right Over-Axle Pipe
    • (1) Left Over-Axle Pipe
    • (2) 2.5 in. Band Clamps
    Installation Info
    Tech Specs
    Cat-Back Exhaust Specifications
    Piping Material: 409 Stainless Steel Tip Material : Polished 304 Stainless Steel
    Piping Size: 2.5" Tip Size: 4.0"
    Muffler Type: Straight Through Fitment: 2005-2010 GT, Bullitt and Shelby GT500
    Will it fit my Mustang?
    • Bullitt - 08, 09
    • GT - 05, 06, 07, 08, 09, 10
    • GT500 - 07, 08, 09, 10

    People Who Bought This Item Also Bought

    Most Helpful Reviews

    Awesome Sound

    Just what I was looking for....Flowmaster did an incredible job with these !!! They spent alot of time on perfecting these. They even do these purge/pop sounds on my manual shift Stang when im coming to ...

    Read More
    Helpful (5)

    Your neighbors will hate you!

    These puppies are 100x louder than stock! They really make the 3v come alive, love the pops and gurgles. There is a noticeable drone around 2k RPM so consider yourself warned. I haven't used my radio ...

    Read More
    Helpful (1)

    Overall Rating 4.6 out of 5 stars
    Read All 10 Reviews

    Customer Photos (2) Submit Your Photo

    View All 2 Photos

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    5 Questions / 5 Answers

    Ask a Question

    Will this fit my v6 mustang?


    • The Flowmaster Outlaw Cat-Back Exhaust will not fit a V6 Mustang. It will only fit 05-10 GTs and GT500s


    Helpful (0)

    What aftermarket X pipes and headers would work well with this system?


    • Any X Pipe with a 2.5" overall diameter or step down, and matching headers will work with the Flowmaster Outlaw Cat-Back Exhaust


    Helpful (0)

    Will this hook up to my factory H pipe on my 2008 GT?


    • Hello, You will be able to fit this to your factory mid-pipe without any issues.


    Helpful (0)

    For 2010 Gt can i hook these right up to the existing h pipe, have to wait to get catted x-pipe and headers.


    • You would be able to hook these right up to your stock H-pipe yes!


    Helpful (0)

    what will i need to do to apply this exhaust to my 07 v6?


    • You will need to purchase either an H-pipe or an X-pipe that has the same 2.5" piping size as this cat-back exhaust as well as purchasing an exhaust hanger kit to keep these from dangling and/or dragging.


    Helpful (0)

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    Customer Reviews (10) Write a Review

    Overall Rating 4.6

    out of 5 stars

    Installation Time:Afternoon

    • Loudness / Volume 4.6 4.6
    • Exhaust Note 4.7 4.7
    • Fit & Finish 4.3 4.3
    • Bang For Your Buck 4.7 4.7

    • 5/5

      Installation Time: Afternoon

      April 04, 2017

      Awesome Sound

      Just what I was looking for....Flowmaster did an incredible job with these !!! They spent alot of time on perfecting these. They even do these purge/pop sounds on my manual shift Stang when im coming to a stop or downshifting.....its hard to describe but was an unexpected added bonus. These sound awesome when cruising and they sound like a monster when you open it up. I truly am stunned at how good these are. Great quality, sound, and fit !!! Well worth the money. I am very pleased.....thank you Flowmaster !!!


      Year: 2007 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Afternoon

      November 15, 2017

      Your neighbors will hate you!

      These puppies are 100x louder than stock! They really make the 3v come alive, love the pops and gurgles. There is a noticeable drone around 2k RPM so consider yourself warned. I haven't used my radio since the install too busy listening the exhaust note. Another warning, will decrease your gas mileage as you will be inclined to drive around in lower gears (higher rpms) to let the whole world hear your primal roar!


      Year: 2009 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      July 21, 2017


      Easy install and very loud. Glad my neighbors love me hahaha. Has a very aggressive sound. I paired mine up to Pypes long tube headers and shorty O/R Xpipe.....yes im crazy loud. Check out my instagram for video proof @italian_god


      Year: 2008 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Less than 1 Hour

      November 28, 2016


      Sounds amazing ! I like the sound of flowmaster. They really bring out the beast in the mustang gt.


      Year: 2009 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Less than 1 Hour

      October 29, 2016

      Great service

      I like flowmaster because it has a great sound and an easy installation


      Year: 2007 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      November 10, 2017

      Installed on a v6

      I installed these on my 07 v6 with magnaflow xpipes. Everyone thinks my car is a GT. Turns heads and sounds better than my friends GT. Everyone says a v6 will never sound like a v8 but man... these are loud. These give my sixxer a really deep and solid growl. And these are loud. This is how a mustang should sound. BUY THEM.


      Year: 2007 Submodel: V6

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      September 23, 2017

      Awesome sound, but......

      System sounds great (as expected), however it was shipped with large scratches on the mufflers. For that, I had to give 2 stars for fit and finish. I assume that during processing the pipes were drug across them, creating the big scratches. Had my shop repaint the scratches with black engine paint.


      Year: 2009 Submodel: GT500

      Helpful (0)

    • 4/5

      Installation Time: Afternoon

      August 28, 2017

      great sound

      I love flowmaster i had 40s on my old gt now I have 2006 gt and it sounds great. it pops at high rpms. I plan to put pypes off road X pipe on next then it will really sound nasty. only negative I have for this product is I had trouble installing them. the passanger side hanger wasn't lineing up right so I had to have a shop welid the camp on, other wise great product great sound and fast shipping.


      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      July 27, 2017

      I love my new exhaust!

      This exhaust fit exactly like factory and looks and sounds amazing! Every day i start my car now i get a smile on my face because the exhaust tone. I could not have made a better purchase!


      Year: 2009 Submodel: GT

      Helpful (0)

    • 4/5

      Installation Time: Afternoon

      March 13, 2017

      Great Sound!

      Just installed and sounds great. I thought it would be a little louder, but either way, they still produce a great tone. I would have given it a 5 star, just wish they were a bit louder.


      Year: 2006 Submodel: GT

      Helpful (0)

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