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Flowmaster Force II Axle-Back Exhaust (11-14 V6)

72 Reviews
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  • Item #18414
  • MPN #817497
  • Market Price $665.99
  • You Save 10% ($66.39)
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Product Videos Customer Photos
  • Aggressive Flowmaster 60-series Delta Flow sound
  • Polished stainless steel 4" tips
  • Durable 409 Stainless Steel Construction
  • Includes two Flowmaster 60 series mufflers
  • Fits 2011-2014 V6 Mustangs
See our 2011 GT Project Car Now
Signature Flowmaster Sound. Give your 3.7L V6 Mustang that unmistakable Flowmaster sound with a Force II axle-back from AmericanMuscle. The Flowmaster Force II Axle-back Exhaust with its mandrel bent tubing will greatly improve your Mustangs exhaust flow for an increase in power, and the included 60 Series Delta Flow Mufflers will improve your exhausts sound for a deep aggressive muscle car exhaust note.

Quality Construction. Constructed from durable 2.5" 409 stainless steel tubing for its corrosion resistant properties, the Flowmaster axle back features special 5" X 10" chambered 60 Series mufflers with massive 4.0" diameter polished stainless steel tips for muscle car looks and sound. As an added bonus the tips are embossed with the "Flowmaster" logo for true custom styling.

Application. This Flowmaster Force II Axle-Back exhaust system is designed to fit the 2011-2014 and newer 3.7L V6 Mustang for both great looks and great sound.

Mustang Fitment: 2011 2012 2013 2014 Details

What's in the Box
Hardware included:

  • (2) Mufflers
  • (2) Stainless Tips
  • (1) Parts Kit
  • (2) 3/8" Hanger Keepers
Installation Info
Tech Specs
Axleback Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished Stainless Steel
Piping Size: 2.5" Tip Size: 4.0"
Muffler Type: Chambered Fitment: 2011-2014 V6 Mustangs
  • V6 - 11, 12, 13, 14

Most Helpful Reviews View All

Overall Rating 4.6/5 Write a Review
Flowmaster Exhaust

This product seems pretty good, the mufflers were painted, looks like flowmaster dripped a little paint nd the paint seemed to have been coming off in a few spots though its stainless steel so it wont

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Helpful (18) (2)

You Bought These To Make Noise, Right?

I've used Flowmasters for years and really like the sound and quality of the product. My stock exhaust was just too quite; I really couldn't hear much at all from the driver's seat. These new mufflers

Read More
Helpful (11) (1)


Hey, I’m Justin with, and I’m going to be checking out Flowmaster’s Force II series axle-back exhaust for the 2011 and newer V6 Mustang. The Force II utilizes Flowmaster’s classic 40-series View Full Transcript

Customer Photos (23) View All

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Q & A (7 Questions, 9 Answers) Ask a Question

Would the be a simple install for a 2010 V6 ,already fitted with dual exhaust? Thinking about getting these for my 2010 V6 which already has dual exhaust, and I want to know if these will be a simple install or a more time consuming and expensive one. I now this is probably a simple questions but id appreciate the help. thanks in advance

NDV6 Year: 2010 Model: V6

Question Resolved
Good Question (0) (0)
  • This exhaust is designed for use with the 2011-current 3.7L, not the 4.0 that came in your car.

    Helpful (0) (0)

    cobrajet Year: 2012 Model: V6

Show 1 more answer

Will Axle-Back increase Horsepower or is it mainly for the improved sound? What are benefits to doing all at once with a CATBACK installation?

RichieRich Year: 2011 Model: V6

Question Resolved
Good Question (1) (0)
  • You will see a very minimal power gain with the axle-back, their will be a slight improvement because it will be more free flowing than the stock set up. There will be a larger gain with a catback setup however, still relatively moderate if its not paired with an aftermarket midpipe or headers as well as if the intake is still the stock, more restrictive assembly.

    Helpful (4) (0)

    Best Answer

    Erik1 Year: 2004 Model: GT

    Top 500 Contributor

Show 1 more answer

Newbie here sorry.... Does this increase or hinder MPG? or None? I just wanna keep the MPG hence V6....

Ruiz Year: 2013 Model: V6

Question Resolved
Good Question (0) (0)
  • No need to apologize, everyone has to start sometime. But down to business, at your current level, this wouldn't really change your MPG at all, it would just sound better. If you decided to do performance and thus opened up your exhaust, then your MPG would start going down ever so slightly.

    Helpful (1) (0)

    Best Answer

    302vs351 Year: 1993 Model: GT

    Top 100 Contributor

Show 4 more answers

Reviews (72) Write a Review

  • 5 Stars .71 71%
  • 4 Stars .22 22%
  • 3 Stars .01 1%
  • 2 Stars .03 3%
  • 1 Stars .03 3%

out of 5 stars

67 Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume: 4.033898 4.0/5
  • Exhaust Note: 4.508474 4.5/5
  • Fit & Finish: 4.689655 4.7/5
  • Bang For Your Buck: 4.31579 4.3/5
Filter By Sort By
  • 5/5

    Flowmaster Exhaust

    November 29, 2010

    This product seems pretty good, the mufflers were painted, looks like flowmaster dripped a little paint nd the paint seemed to have been coming off in a few spots though its stainless steel so it wont rust. The kit was fairly easy to install but the right side didn't want to go into the hanger brackets and I had to remove the hanger bracket because the pipe coming from the cat was in the way, so I removed the bracket put it on the mufflers hangers and reinstalled it once the muffler was connected to the mid pipe. That side sat a little off but the left side was dead center on the cutouts on the bumper. Sound is great a little on the quiet side but once you get on it, you can hear it. Tone quality is WAY BETTER THAN STOCK EXHAUST. Though I had a few Install issues the kit was well worth it. I haven't had it dyno'd yet planning on doing that in January but this is a kit to buy based on sound and appearance. Also flowmaster warranty is 10 years so if something goes wrong they will replace it. Easy to install all you need is a ratchet set 2 ratchets needed for the tail pipes I did it in my driveway without jacks or a lift.

    Ryan Waller

    Driving Style: Daily Driver

    Helpful (18) (2)

  • 5/5

    You Bought These To Make Noise, Right?

    August 27, 2011

    I've used Flowmasters for years and really like the sound and quality of the product. My stock exhaust was just too quite; I really couldn't hear much at all from the driver's seat. These new mufflers really woke up the sound, but are generally mellow in cruising- just what I wanted. Noticed a bit of an uptick in power in the midrange. My only complaint is they do tend to drone a tad around 79-81 mph on my car. Solution is to set the cruise a little above or below that speed. The tips look amazing and really make the stock ones look like something you don't won't to step in. In response to some of the other comments on here: Dude, you will REALLY regret cutting the hangers in the very near future. Just push harder, use silicon lube, and the stock hangers come right out of the donuts. On the Goodyear shop install- the fit of these mufflers are VERY adjustable; just losen the clamp and slide them laterally to get the tailpipe to line up with the bumper cutout. Nobody should pay to have these installed unless they can't tell an Allen wrench from a screwdriver. Sound? What's all this complaining about how they're too loud? That's why you bought them, right?


    Year: 2011 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 4 Washington State

    Helpful (11) (1)

  • 5/5

    No regrets

    March 05, 2012

    First I would like to say that I was that guy that was really worried about what exhaust to buy because I did not want an exhaust that was too loud and obnoxious. Also I did not want an exhaust that is too quiet that you can not hear. After many nights of staying up late reading reviews and watching clips I knew that the flowmasters were for me. Not to mention they were also priced the best out of all the axle backs for the 2011-2012 mustang v6. When I first turned the engine on and heard the roar from the exhaust, I knew I made the right choice. This exhaust has a great deep idle to it. When you stop on the gas you are rewarded with the most pleasing sound. Only problem is, you don't want to take your foot off the gas. Trust me when I say you will not be disappointed. I would recommend this product to anyone wanting a louder and deeper exhaust for their mustang v6. Also I would like to add that I had this installed at a shop along with an Airraid cold air intake and the Barton shifting bracket. All together it cost me $200 for installation for all three. Finally I would just like to thank American Muscle for being very helpful and their knowledgeable staff who was able to answer every single one of my questions.


    Year: 2011 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 New York

    Helpful (10) (2)

  • 5/5

    Great Sound

    January 04, 2012

    Just installed them today and i got to say it sounds great at idle very deep tone and you will notice the difference. I thought it will be louder from all the videos that i found online. But it does the job great. When just cursing the road the muffler has a great sound and deep tone but if you step on it that is a very different story. I am very impressive how my v6 sounds. To be honest you may say at idle has that tone of a v8. Took me a hour to install them and to align then to my liking. so i do recommend them to whoever wants a v8 sounding v6.


    Year: 2012 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 3 El Paso

    Helpful (7) (1)

  • 5/5

    Easy, Peazzy

    May 07, 2013

    Quickest install ever; took me about 30 minutes to do. Only encountered a slight problem with the fact that the factory tack welded my old exhaust on. Took a few rubs with the hack saw to free it. Overall the sound is great! I was a bit worried about this "drone" people have been complaining about at higher speeds but I haven't heard a drone at all. Good buy though, makes my Mustang sound like a MUSTANG :).


    Year: 2012 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 California, USA

    Helpful (4) (0)

  • 5/5

    Oh the sound!

    May 30, 2012

    I've got both the Airaid CAI and the flow master axel back exhaust. I never really listened to the stock exhaust as I installed both as soon as I left the dealer. All I can say is that sound just makes me want to never let off the skinny pedal except to just run thru all the gears again and again. The installation was simple and straight forward, the fit and finish is beautiful. The sound is not obnoxious at all but it begs you to push the car. The only problem, if you want to call it a problem, is the need to hear that wonderful sound has produced three tanks of gas averaging 19 mpg. I just can't seem to lay off and see what kind of mpg's this V6 can get. But it's just too much fun to care. If you have the V6, get a CAI and this exhaust. You will love it!


    Year: 2013 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 San Antonio, TX

    Helpful (5) (1)

  • 5/5

    This Product has great looking extensions

    January 27, 2012

    I'm very impressed with the deeper sound. I've gotten many compliments. I would recommend this product to anyone that wants a deeper sound.


    Year: 2011 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Calgary, AB, Canada

    Helpful (4) (0)

  • 5/5

    the classic muscle car sound you should expect from flowmaster

    August 24, 2011

    i reviewed every axle back exhaust for my 2012 v6, and heard all the sounds clips and the best muscle car sound, not ricey, but purrrre american muscle sound that pairs perfect with the new v6 mustang is w/o a doubt the flowmaster. i love the sound this exhaust makes, and it's quiet going down the road cruising, but when you hit it, you get the perfect tone. it's lighter, better looking and sounds 10x better than the stock pipes. i wouldn't go with any other exhaust on this, my only slight complaint is when we installed them i had to have the exhaust shop straighten them out but besides that, great exhaust and a 10 yr warranty, and also the cheapest one out, i 100% recommend this to anyone who has a 2011+ v6, buy it, you won't be disappointed.

    Top 1000 Contributor


    Year: 2012 Model: V6 'Stangs I have owned: 2 Albion NY

    Helpful (3) (0)

  • 5/5

    Great product

    March 20, 2011

    I bought these axle backs after I got my car and it was super easy and I had no problems doing the job without even lifting the car. I love the tone its quiet for my neighbors but when I punch it on the streets it still screams power. I could notice the change in pressure on the exhaust and would guess it to give 5-7 HP just a little more that I could notice. I love these mufflers and am glad I bought them.

    Anthony M

    Year: 2011 Model: V6 Driving Style: Daily Driver

    Helpful (2) (0)

  • 5/5

    Flowmaster After Axel Force II for V6

    January 19, 2015

    At 76 I decided to have the Muffler man Install the product. All went well but he ad a heck of a time getting them aligned out the back end. In fact he spent more time doing that that the rest of the installation, but his work was excellent for $86. The sound is just what I was looking for . . . very mellow and deep, definitely more noticeable, but not offensive. Now it is more reminiscent of my original 64 1/2 Pony car with four on the floor, tach. and a 289 V8 with a four barrel carb. It's been 50 years since I am back in the saddle again and even if it's my past mid-life crisis, I am enjoying!


    Year: 2014 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 2 YUba City, California

    Helpful (1) (0)

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