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Flowmaster Pro Series Axle-Back Exhaust (11-12 GT, 11-12 GT500)

AmericanMuscle no longer carries the Flowmaster Pro Series Axle-Back Exhaust (11-12 GT, 11-12 GT500). Please check out 2010-2014 Mustang Axleback Exhaust for an updated selection.
46 Reviews
Our Price

$528.88

  • Item #18415
  • Market Price $587.99
  • You Save 10% ($59.11)
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AmericanMuscle no longer carries the Flowmaster Pro Series Axle-Back Exhaust (11-12 GT, 11-12 GT500). Please check out 2010-2014 Mustang Axleback Exhaust for an updated selection.

Product Videos Customer Photos
Features
  • Deep, Aggressive Flowmaster Sound
  • Increases Horsepower and Torque
  • Polished stainless steel 4" tips
  • Includes two Pro series mufflers
  • 409 stainless steel construction
  • 18lbs Lighter Than Stock
  • Fits 2011-2012 GT and 2011-2012 Shelby GT500 Mustangs
Description
Aggressive Flowmaster Sound. Give your 2011-2012 Mustang GT or GT500 that unmistakable Flowmaster sound with the Pro Series Axle-Back 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 Axle-Back 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" 409 stainless steel tubing for its corrosion resistance, this Flowmaster axle-back features two Pro series mufflers with 4" diameter polished stainless steel tips that are embossed with the "Flowmaster" logo for true custom styling.

Application. This Flowmaster Pro Series Axle-Back exhaust system is designed to fit the 2011-2012 5.0L Mustang GT and 2011-2012 5.4L Shelby Mustang GT500 for both great looks and great sound.

Fitment: 2011 2012 Details

Won't fit? Add an exception

What's in the Box
  • (2) Muffler assemblies
  • (2) Clamps
Installation Info
Tech Specs
Axleback Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished Stainless Steel
Piping Size: 3" Tip Size: 4"
Muffler Type: Perforated Tube Fitment: 2011-2012 Mustang GT & GT500
Will it fit my Mustang?
  • Boss 302 - 12
  • GT - 11, 12
  • GT500 - 11, 12

Most Helpful Reviews

5/5
Hushpower

They installed easily, sound and look great. Louder than my brothers '05 with American Thunder and louder than advertised but still great for daily driver! Has a deep muscle car tone, best of all no d ...

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Helpful (20)

5/5
Hush is good

Bought this for my 2011 5.0. The car came alive over the stock. It's much louder than stock but I'd say it's a lower-middle sounding volume. Perfect for daily drivers. Also, the big tips fill out the tip ...

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Helpful (20)

Read All 46 Reviews
Overall Rating 4.7 out of 5 stars

Videos

Hey everyone I’m Justin with AmericanMuscle.com and I’m taking a look at Flowmaster’s Pro Series axle-back exhaust for your 2011 and up Mustang GT. The Pro Series designed to give you that classic Flowmaster View Full Transcript

Customer Photos (6) View All Photos

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Customer Reviews (46) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume 4.21875 4.2
  • Exhaust Note 4.5625 4.6
  • Fit & Finish 4.5625 4.6
  • Bang For Your Buck 4.5 4.5



  • 5/5

    January 27, 2011

    Hushpower

    They installed easily, sound and look great. Louder than my brothers '05 with American Thunder and louder than advertised but still great for daily driver! Has a deep muscle car tone, best of all no drone!

    Elton

    Helpful (20) (2)

  • 5/5

    December 11, 2010

    Hush is good

    Bought this for my 2011 5.0. The car came alive over the stock. It's much louder than stock but I'd say it's a lower-middle sounding volume. Perfect for daily drivers. Also, the big tips fill out the tip area real nice. Gives a better look in the rear end when looking at it from the back, looks great. sounds great.

    Justin

    Helpful (20) (3)

  • 5/5

    January 01, 2011

    2011 GT

    Installed the Hushpowers on my new 5.0. They sound much better than the stock mufflers. A little louder than expected but still not too loud inside the car.

    Don

    Helpful (16) (2)

  • 5/5

    June 23, 2011

    Cleans Up The Back Nicely!

    The Hushpowers are virtually invisible from the back. They fill out the cutouts on the GT/CS much better than the stock mufflers. Nice deep sound with no rasp.

    Brian

    Helpful (5) (0)

  • 5/5

    May 10, 2011

    wow!!!!!

    very nice deep sound a low rpm,reveal the beast inside ,the back hole a fuller now...very good , thank's a.m!!!!

    martin corriveau

    Helpful (5) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    September 23, 2011

    Great Sound

    Installed these mufflers in about an hour and am really happy with the result. They sound much better in person than they do in any youtube video, a real low rumble that is not intrusive at idle or at cruising speed but really roars at throttle. Several people have commented on being able to hear a lope in the exhaust note at idle due to the low frequencies. Installation is a breeze though I would do it this way vs. the supplied instructions: Remove the exhaust hangars from the car before removing the stock system, once off of the car install the hangars on the new mufflers then put them in place and attach them to the car. If you try to leave the hangars in place and pull the old mufflers out you will be getting very frustrated and I can't imagine what reinstallation would be like! Get them if you want a deep throated exhaust note instead of a higher raspier sound, love them!

    Nalcyon

    TX

    Helpful (4) (0)

  • 5/5

    June 07, 2011

    FM Hushpower axle backs

    ordered these not knowing what to expect sound wise. they sound so deep and amazing! no noticeable SOP power gain but the amazing sound is worth the price of admission.

    Scott

    Helpful (4) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 12, 2012

    Amazing Product

    The sound and tone is great, not overbearing, and it only took about 40 minutes to install. Not a noticeable increase in horsepower, but definitely worth the money. Plus, after doing some research, Flow Master is an American company, who uses American materials, and is totally made in the USA.

    mustangmikey76

    Colorado Springs, CO, USA

    Helpful (3) (0)

  • 5/5

    August 07, 2011

    Great sound, not too much

    Received the order fast to Canada, well packed, not damaged, i did the installation alone and never did that before, with minimal instruction help, took about 1.5 hour total. Sound is just what i expected from video on youtube. Fit perfectly.

    Pasqual Boucher

    Helpful (2) (0)

  • 5/5

    August 28, 2013

    Nice improvement over stock

    I got my hushpowers today...3 days from ordering and installed them this afternoon in about 1.5 hr...once I got the car positioned in the garage and tools together. Installation is pretty much as everyone described. You are either going to have to remove the panhard bar or remove the front muffler bracket on the drivers side. I chose to remove the bracket...I never like to remove bars while on jack stands. I've had too many bad experiences in the past with bolts not lining up on re-install. Anyway, the bracket is a little hard to remove because there is a bolt right in the middle above the muffler, but you can get to it with an offset hand wrench. Passenger side is a piece of cake with nothing having to be removed but the muffler. I also used a jack stand to raise and support the intermediate pipes. Getting them out of the way makes removal and install much easier. Installing the flowmasters is really easy. If you wanted to change out these for outlaws or something similar, it would probably only take 15 or 20 min depending on your work area and car lifting situation. A skinny guy could probably do it without raising the car at all. Sound: the sound is definitely an improvement over the stock exhaust but not as loud as people keep saying, in my opinion. If you drove muscle cars from era 64-71, then these won't sound loud...more like a medium aftermarket set on a 70 302 or something. I don't remember people griping about drone back then. By today's standards I still wouldn't say these are loud at all. I had to get out of the car and stand behind the pipes before I could tell a lot of difference. You won't disturb neighbors with these. Regarding the comments about these being too loud...really....if they were any quieter I don't know why anyone would bother. Two things are definitely noticeable that I really like: low rumble at idle and slow crawl is as good as I've ever heard; and when you get on it there is a noticeable muscly growl....just not really loud. Of course you could keep a set of Outlaws and swap them out on days you're feeling aggressive.

    Drumwraith

    GA

    Helpful (1) (0)

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