Flowmaster Mustang GT/GT500/Bullitt Outlaw Axle-Back Exhaust System (2005-2010)

2 Review(s)
$64.05 (10%)
Flowmaster's 817511 Outlaw Cat-back systems are designed as a direct fit for 4.6L powered Mustangs years 2005-2010. They are an aggressive free flow exhaust that get your car noticed on the street and at the track.

Part Number: 159 817511
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It's unclear why Flowmaster named this the "Outlaw"system. Unlike your stock exhaust that's been robbing you of horsepower, the Outlaw system gives you free horsepower without leaving your pocket book empty. 

Bark & bite. Flowmaster's Outlaw systems extract a aggressive muscle car tone from your 3-valve mod motor. In addition to an authoritative tone, the free flow race style mufflers increase horsepower and are a great complement to bolt on power adders.

The bones. The foundation of this durable system is 16 gauge 409 stainless. The mandrel bent tube measures 2.50" diameter and terminates into 4" diameter polished stainless tips. The polished tips feature an embossed "Flowmaster" logo and are a nice contrast to the black coating applied to the remainder of the system.

The breed. This system was designed to be compatible with all varieties  of V-8 powered ponies fitting GT, GT500 and Bullitt models. 

Features & Benefits:

  • Dyno proven performance gains
  • Super aggressive sound
  • T409 stainless construction
  • Made in the USA
  • 4" polished tips
About Flowmaster: Since its start in 1983, Flowmaster has been designing chambered mufflers for racecars and streetcars. Designed to deliver great sound without hindering performance, the mufflers took the cars to another level. Taking their expertise in performance mufflers, the team at Flowmaster designs complete exhaust systems that transform your Mustang. Every system is tested and proven to elevate your Mustang's performance. Don't compromise with subpar exhausts, get the system that is rooted in racing, and upgrade to Flowmaster.

CA Residents: Cancer and Reproductive Harm WARNING www.p65warnings.ca.gov.

Fitment & Features


Manufacturer: Flowmaster

Vehicle Fitment:

Fits Model Year: 2005, 2006, 2007, 2008, 2009, 2010

Customer Reviews

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THE loudest!
I've had 3 S-197's now. The first one had the stock exhaust and I purchased FFRP (Ford Racing) exhaust which actually had a nice deep sound and quality tone but...It left me wanting more. Everytime other modded Mustangs drove near me I was jealous of how much louder their exhausts were. So, after research I ordered the Flowmaster Outlaws. The sound was so loud that it shook the ground and I immediately fell in love. The minute I bought my second 2005, I immediately ordered Outlaws. After a few years, I was still turning heads everywhere I drove but the interior drone was starting to get to me. Folks, you don't know what loud is until you try these. It's insane! If you live near... well.. anyone... you WILL get complaints. If you really don't like your neighbor, get these. lol This summer I once again bought an 05 and I had a little extra money so I wanted something comparable to the outlaws but with a higher quality rating so I ordered Borla Attacks. Yes they were loud but they actually popped more than the outlaws and I personally don't like that because it sounds like a modded car rather than a loud Mustang muscle sound. They had less interior drone than the Outlaws and they were very loud but I am telling you, not as loud as the Outlaws really and more than twice the price. I'm not in any way knocking the Borlas, they really are great quality but again, for the price they didn't feel like the Flowmaster Outlaws. After two weeks, if you can believe it, I took off the Borlas and put back the Outlaws and again fell back in love, like reuniting with your first. The Flowmaster Outlaws are the absolute loudest axle back exhaust you can get and at an unbelievable price. They don't sound cheap like many others, they don't popcorn pop every 10 seconds and I guarantee you that you will thank me the second you have that first cold start. True muscle car sound that makes you look for tunnels and downtown skyscraper streets. Deep growl, not high pitched, INSANELY loud even at idle. Expect the loudest thing you have ever heard, expect a LOT of cabin noise (you get used to it), expect to turn off your radio just to hear the growl as you smash the throttle, expect a lot of attention, expect never to be out-done if others try to compete with the thundering sound, they won't win.
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Flowmaster Outlaws
I perviously had the BBK Varitunes, way to quiet for me, so I got these flowmasters after weeks of sound clips and research. Completely changed the sound of my 2006 S197. They bring out the muscle car Growl if that's what your looking for, one of the loudest on the market for the S197 IMO. If your on the edge of buying them, don't wait any longer, GET THEM!!!! I was not disappointed.
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