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

Item 393798
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Market Price $736.99 You Save 12% ($85.04)
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$651.95 (each)

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      Video Review & Installation

      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

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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


      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

      Flowmaster 817515

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      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

      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 ThroughFitment:2005-2010 GT, Bullitt and Shelby GT500

      Customer Reviews (100+)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

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

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