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Flowmaster Pro Series Catback Exhaust (11-12 GT)

6 Reviews
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  • Item #18463
  • MPN #819112
  • Market Price $909.99
  • You Save 9% ($83.99)
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Product Videos Customer Photos
  • Deep, Aggressive Flowmaster Sound
  • Durable 409 stainless steel construction
  • 3" mandrel bent tubing
  • 4" polished stainless steel tips
  • Includes two Pro Series mufflers
  • Fits 2011-2012 GT
Aggressive Flowmaster Sound. Give your Coyote Powered GT that unmistakable Flowmaster sound with the Pro Series Catback exhaust system. This system improves exhaust flow using Flowmaster's perforated tube style mufflers for that throaty, aggressive exhaust note your high powered Pony deserves. Increases Horsepower and Torque. This Flowmaster Pro Series Catback exhaust system not only improves the sound of your Mustang, but with it's free flowing design it also improves throttle response and increases horsepower & torque.

Quality Construction. Constructed from durable 3" 16 gauge 409 stainless steel tubing for corrosion resistance, this Flowmaster Catback features two Pro Series mufflers with massive 4.0" diameter polished stainless steel tips for impressive muscle car styling and sound. As an added bonus the tips are embossed with the "Flowmaster" logo for a true custom appearance.

Application. This Flowmaster Pro Series Catback exhaust system is designed to fit the 2011 to 2012 5.0L Coyote Powered GT Mustang for both great looks and great sound. Does

not fit Shelby GT500 models.

Mustang Fitment: 2011 2012 Details

What's in the Box
  • (2) Muffler assemblies/li>
  • (2) Over axle pipes
  • (4) Clamps
Installation Info
Tech Specs
Axleback Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished Stainless Steel
Piping Size: 3.0" Tip Size: 4.0"
Muffler Type: Chambered Fitment: 2011-2012 GT
  • Boss 302 - 12
  • GT - 11, 12

Most Helpful Reviews View All

Overall Rating 4.7/5 Write a Review
Best Sound

Installation took just over two hours using a lift. Fit and finish are great. Very happy with the look and the deep tone without all the rasp. Loud when you get on it and quiet while cruising. I can still

Read More
Helpful (2) (0)

Here comes the BOOM!

Nice, loud and throaty...what more is there to say?

Helpful (1) (0)


Hey I’m Justin with and this is my brief overview of the Flowmaster Pro series catback exhaust, fitting all 2011 and 2012 Mustang GTs. This entire system is designed around these shorty View Full Transcript

Customer Photos (1) View All

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Reviews (6) Write a Review

  • 5 Stars .67 67%
  • 4 Stars .33 33%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars 0 0%

out of 5 stars

6 Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:$100-$250

  • Loudness / Volume: 4 4/5
  • Exhaust Note: 4.5 4.5/5
  • Fit & Finish: 5 5/5
  • Bang For Your Buck: 4.5 4.5/5
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  • 5/5

    Best Sound

    August 30, 2013

    Installation took just over two hours using a lift. Fit and finish are great. Very happy with the look and the deep tone without all the rasp. Loud when you get on it and quiet while cruising. I can still listen to the radio and talk on the phone without a problem. Great product, and easy to install.


    Year: 2011 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 3 Florida, USA

    Helpful (2) (0)

  • 4/5

    Here comes the BOOM!

    April 10, 2014

    Nice, loud and throaty...what more is there to say?


    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Chicago, IL

    Helpful (1) (0)

  • 5/5

    Great sound

    May 12, 2014

    Opening the box, system looks to be of really good quality. Welds appear to be consistent and solid throughout and the bends smooth. The hushpowers are nice looking and we'll constructed. On to the install. Removing the old pipes was probably the hardest part of the install. Previous owner had installed aluminized steel pipes and they had rusted together. Once that was off, installation was a breeze. If you haven't done an exhaust before, read the instructions before you start, it will save you time. Fitment is great if not a bit tight, had to muscle the x-pipe on the headers, but it says to apply some in the instructions. Still working on centering the tips, but nothing major. One note, I had to hammer out the axle-backs to get out the little metal piece(make sure you take them out) and to get them on the over-axles. On to the meat and potatoes, what everyone cares most about, the sound. The sound clips do not do it justice. I love the sound, much deeper and more aggressive than my previous exhaust. The wife even loves it, so it's a win. At a certain point when the car is warming up, the bass from the exhaust is almost nauseating. Accelerating, it's most pronounced in cabin around 1800-2200, and then it smoothes out to a nice, deep tone. Driving around town and on the highway, I notice little to no drone, the gear noise I get from the solid mount upper control arm I just added is more pronounced and annoying. You won't be disappointed if you are looking for an aggressive yet streetable exhaust. Noticed maybe a little performance gain over previous system, could also be the combination of mods I did while I had the car up along with the increased exhaust volume. Be prepared to smell a pretty strong burning smell for the first few days, but don't worry (the wife did), it goes away. It is quite common from all I've read and heard. Overall, I would buy this system again in a heartbeat.


    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Minot, ND, USA

    Helpful (0) (1)

  • 4/5

    Exhaust louder than I expected

    January 16, 2015

    Great product, but even with online investigation it is louder than i expected (or hoped). The stock exhaust is rather sedate, the Flowmaster Pro series is not just more robust and louder, but multiple levels louder. I have to get used to it. If I had anticipated such a dramatic change, I would have looked for a more pedestrian exhaust.


    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Melbourne Florida

    Helpful (0) (0)

  • 5/5

    Awesome Sound

    October 27, 2014

    I am amazed at how great my Coyote sounds now, this Flow Master system rocks. I am not sure if I got any HP gains but I can tell that the throttle response seems better and I know that the exhaust is flowing better since the pipes are mandrel bent and larger. It is allot louder now than the stock pipes but not obnoxious loud, but you can sure hear it coming down the road now. The stock pipes had irregular bends and indentations in them that would restrict the flow. Installations was pretty easy since we did it on a lift and it took about 2.5 hours including removing the old ones. This is one upgrade I highly recommend and American Muscle has the best price too.


    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Mesa, AZ, USA

    Helpful (0) (0)

  • 5/5

    Whoo Hooo!!!

    September 22, 2014

    I am completely THRILLED with this exhaust. The sound is excellent, not to loud, not too soft. I definitely attract attention when I go through town now. Ford should put this exhaust on from the factory!!


    Year: 2012 Model: GT Driving Style: Show 'Stangs I have owned: 3 Alabama

    Helpful (0) (0)

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