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Flowmaster Force II Axle-Back Exhaust - Aluminized Steel (05-10 GT, GT500)

Item 18403
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Market Price $498.99 You Save 12% ($59.04)
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$439.95 (pair)

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    Features, Video & Details

    • Aggressive Flowmaster 60-Series Delta Flow Sound.
    • Polished Stainless Steel 4" Tips.
    • Durable Aluminized Steel Construction.
    • Includes Two Flowmaster Mufflers
    • Fits 2005-2010 GT and 2007-2010 Shelby GT500 Mustangs.

    Review & Installation Video

    Review & Install Video

    I’m Justin with AmericanMuscle.com, and this is our detailed breakdown of Flowmaster’s American thunder series Axle-back for the 2005-2010 Mustang GT. This kit from Flowmaster centers around those patented classic 60 series delta mufflers that are responsible for that iconic Flowmaster muscle car sound and rumble. Flowmaster is one of the only companies that chooses to use 16-gauge aluminized steel for their exhaust versus stainless steel. Now that coated steel is going to be great for resisting corrosion, and that sleek black finish is going to look really sharp underneath the rear bumper. Now the entire kit is finished off with these dual 4” tips and embossed with that iconic Flowmaster logo. Getting the American Thunder bolted up to your ride is a very straightforward task that should take you no more than an hour using some basic hand tools. Now let’s see how Flowmaster’s American Thunder sounds compared to our factory exhaust.

    Flowmaster Sound. The Flowmaster Force II Axle Back exhaust system, with it's patented 60 Series Delta Flow chambered mufflers will improve your GT or GT500 Mustang exhaust flow for an increase in power and a throatier exhaust note.

    Quality Construction. Constructed from durable 2.5" 16 gauge aluminized steel tubing for it's corrosion resistant properties the Flowmaster Axle Back features specialty 5" X 10" chambered 60 Series Delta Flow Force II 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.

    Fitment. This aluminized steel Flowmaster Force II Axle-Back Exhaust System is designed to fit the 2005-2010 GT and the 2007-2010 Shelby GT500 Mustangs for both great looks and great sound.

    Technical Note: Americanmuscle recommends adding the 2005+ Mustang 304 Stainless Steel Exhaust Hanger Kit from the drop down option above, to provide more strength, stability and a cleaner installed appearance. If you have a 2007 Mustang you may need the kit for correct installation.

    Fitment: 2005 2006 2007 2008 2009 2010 Details

    MPN# 17410

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    What's in the Box
    • (1) Right muffler assembly
    • (1) Left muffler assembly
    • (2) Clamps
    • (1) Nut
    • (1) Lock Washer
    Installation Info
    Tech Specs
    Axle-Back Exhaust Specifications
    Piping Material: Aluminized Steel Tip Material : Polished Stainless Steel
    Piping Size: 2.5" Tip Size: 4.0"
    Muffler Type: Chambered Fitment: 05-10 GT, GT500 Mustangs
    Will it fit my Mustang?

      Customer Photos (48) Submit Your Photo

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        Questions & Answers (14)

        5 Top Rated Questions

        will this work? if i convert my v6 07 mustang to the duel exaust will these work/will any other GT mufflers work?

        • yes

        Helpful (1) Show 1 more answer

        Will this work? Can i use these axle back exhaust on my 05 v6 mustang if i purchase the pypes x pipe?

        • The short answer is no. I would suggest buying a V6 True Dual Exhaust conversion kit. That way you get all the parts necessary for converting your entire exhaust system.

        Helpful (1) Show 1 more answer

        what are the DB's on this exhaust?

        • Exhast Decibel level is not listed for any of the exhausts we offer, as this can vary from car to car and change based on the rest of your setup.

        Helpful (0)

        Are these mufflers available individually anywhere? I only need the right side muffler

        • The Flowmaster Force II Axle-Back Exhaust is only sold as a kit. We do not sell the mufflers individually.

        Helpful (0)

        Does the Force II have a drone type noise in it. I tried other makers and got a bad drone at 2000 RPM's and driving at 55 MPH the legal speed limit here. The drone is the reason I went back to stock and I would sure like to enhance the current sound.

        • The Flowmaster Force II Axle-Back Exhaust will feature some drone at certain RPMs.

        Helpful (0)
        Post Your Question
        9 More Questions
        How does the aluminized steel hold up to high temps? I have an 08 with long tube headers and no cats. I have the black pype bombs on now, and the powder coating is flaking off due to excessive exhaust temps. 1 answer
        Do I have to buy the hanger kit or can I use my stock hangers and save the cash? Thanks. 1 answer
        Hi everyone! I am kind of confused because of the product information. The price says €380.12 for me (each). Does "each" mean left and right in each case €380.12 or does "each" mean the complete muffler-system (including both)? Because further down it says both mufflers are in the box. Kind regards gzunlimited 1 answer
        Does this exhaust sound good on an automatic (05-10 GT) ? 1 answer
        Will these fit on an 08 GT CS? 2 answers
        Does it add any power or torque 2 answers
        What is the change in noise level within the car? 3 answers
        is this loud when going about 25 or 30mph 5 answers
        Wondering is this available for shipping to Canada? Toronto specifically. Wondering is this available for shipping to Canada? Toronto specifically. 2 answers

          Customer Reviews (100+) Write a Review

          Overall Rating 4.7

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:0-$100

          • Loudness / Volume 4.082644 4.1
          • Exhaust Note 4.541667 4.5
          • Fit & Finish 4.46281 4.5
          • Bang For Your Buck 4.525 4.5



          • 5/5

            Installation Time: Afternoon

            February 19, 2019

            Nice sound over stock mufflers

            Good mufflers if you want a little better growl than stock mufflers. Not to loud as too annoy the neighbors but loud enough to let everyone know you have a V8 under the hood.

            KrisN

            Year: 2010 Submodel: GT

            Helpful (1)

          • 1/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            October 14, 2018

            Not what I expected at all......

            Got the axel back force 11 exhaust in and had set up appointment for them to be installed , got old magnaflows off and the flowmasters that were supposed to fit my car would not fit, instead of offset they sent straight out the middle, so I'm stuck with my car on the rack and the wrong mufflers, being I was being charged by the hour I had him make adjustments to fit, costing me more $$$, Noise level was the same as I had on the car with the Magnaflows,

            GlennT

            Year: 2008 Submodel: GT

            Helpful (5)

          • 3/5

            Installation Time: Less than 1 Hour

            July 20, 2018

            Flowmaster Force II Axle-Back Exhaust

            Video reviews are subjective. I was looking for more loudness over stock pipes, not crazy outlaw sound, which I love and have on my GT but more aggressive than stock pipes. These are built very well and look great but not much louder than stock pipes. The exhaust sound is deep, not raspy, just wish they were a little louder.

            Gus

            Year: 2008 Submodel: GT500

            Helpful (5)

          • 4/5

            Installation Time: Afternoon

            June 26, 2018

            Louder then I thought

            The exhaust tone is ok no drone. However they are louder then there rating. They are a lot louder then stock mufflers. I was looking for a compromise between stock and aggressive sounding . These are not .... Fit and finish is very good....

            aidenshep

            Year: 2006 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Less than 1 Hour

            May 22, 2018

            Way better

            Much better than what I had on the car little louder than stock.fit right up with stock hangers. Much better exhaust note.

            AlexV

            Year: 2007 Submodel: GT

            Helpful (7)

          • 5/5

            April 17, 2018

            2010 GT Mustang 4.6l

            HotRod Cams Kooks long tube headers 62mm throttle body Cold Air Intake Steeda pullies Sounds great with no drone!

            LaurenceM

            Year: 2010 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            January 06, 2018

            Performance without the loudness

            I was looking to install some performance mufflers that would be as quiet as possible . I was not expecting it to be the low humm that it is at idle. But the noticeable difference when you step on it without being annoying.Perfect sound for me sounds nice and and you definitely feel the difference.

            WalterC

            Year: 2007 Submodel: GT

            Helpful (9)

          • 5/5

            Installation Time: Less than 1 Hour

            December 08, 2017

            sounds great

            I have 2006 Gt with K and N intake 3.73 gears pypes off road X and now these flowmasters sound great. easy install car can be quiet but when you hit the gas it’s s deep loud rumble that sounds very good.I love setting off car alarms.

            Beast

            Year: 2006 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            October 17, 2017

            Check size before you buy

            If you are buying a car where you know nothing of it's history, it would be wise to get under there and check what is there. I assumed it was factory and it wasn't' so I had to take it to a muffler shop instead of being able to mount them myself. Otherwise, these provide justtt the right amount of tone, loudness and note that I was looking for. And are quiet enough that I can now hear my supercharger whine. Previous owner had very loud almost straight pipes on it. The exhaust videos of how the different axle backs sound was a great help in my choosing these. If your an older guy (mid 50's) like I amI think you would be pleased with the sound.

            RichC

            Year: 2007 Submodel: GT500

            Helpful (9)

          • 4/5

            August 10, 2016

            Awesome, but not what I thought it was

            Fairly easy install with a friend helping. Sounds great from outside the car and with the windows down. Only problem was I ordered these because I drove a 07 GT/CS that had them and it sounded sick, turns out I guess that one had the whole cat back system with the X pipe, because this one sounds just like it from the outside, but the other I drove had MUCH more drone in the cabin. Which I loved. Hopefully I can add the X pipe in at a later date and get that sound. All in all happy, but I think I was looking for the full system.

            Zeb

            Year: 2006 Submodel: GT

            Helpful (7)

          • 5/5

            July 09, 2016

            Sweet purrrrrrr

            These guys will defiantly turn heads! I get all kinds of people looking, especially Camero losers! Going from first to second gear sounds so sick! I always give it a little more just to show off haha

            Chipper95

            Year: 2009 Submodel: V6

            Helpful (9)

          • 5/5

            Installation Time: Afternoon

            May 02, 2016

            AWESOME SOUND

            BETTER THEN STOCK NICE MUSCULAR SOUND LIKE A MUSCLE CAR SHOULD SOUND VERY NICE PRODUCT SO GLAD I WENT WITH THIS

            Dugs

            Year: 2006 Submodel: GT

            Helpful (8)

          • 4/5

            April 29, 2016

            Flow Masters

            Two parts to this review - first not as easy to change as several reviews made it sound. My 07 is a summer only ride so underside is very clean no rust so all bolts came out easy except one which was due to an over tightened bolt on the passenger side on one hanger. Head snapped off, no fun trying to get this out. Beware. Also alignment can be a challenge, I still don't have it perfect. Space is tight to remove and reinstall hangers and all hangers need to be removed to pull out mufflers. Paint on these Flowmasters also not the best. Wishing I would have stepped up to the stainless or not painted version. Now the fun part once installed, stang warmed up WOW what a great sound! Slightly deeper at idle then stock, hit the gas a WOW these sound great! not to loud nice deep sound. Slightly louder than stock inside the car. No drone - I can believe I waited to put these on. With the KandN Air filter and these you can feel a difference in the power.

            Stangman07

            Year: 2007 Submodel: GT

            Helpful (9)

          • 5/5

            Installation Time: Less than 1 Hour

            April 20, 2016

            American Thunder exhausts

            I was concerned about the sound inside the car and got good advise from AM customer service. Sounds great outside and has a moderate sound inside. I can hear my radio and talk to others while getting thumbs up from passing drivers. Great exhaust.

            GMoney

            Year: 2007 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Less than 1 Hour

            April 13, 2016

            Satisfied

            These mufflers are very easy to install. they have a very good sound as all flowmasters do. Fitted very well. Would highly recomend them if you not looking for really loud mufflers.

            Snakebite

            Year: 2007 Submodel: GT

            Helpful (9)

          • 5/5

            Installation Time: Less than 1 Hour

            March 08, 2016

            Classic Muscle Car Sound

            When I purchased my '07 it came with Kooks headers and x-pipes. I opted for the Flowmaster Outlaws to tone it down a bit as I could drive past local law enforcement without attracting unwanted attention. The Outlaws helped, but still had a deafening drone especially when cruising down the interstate. So, I replaced the Outlaws with the American Thunders and absolutely love that deep, classic, muscle car sound and the drone is gone as well. I should have opted for these first. Installation was a breeze and they look great just peeking out under the rear bumper.

            OldDad

            Year: 2007 Submodel: GT

            Helpful (9)

          • 5/5

            Installation Time: Less than 1 Hour

            September 06, 2015

            Perfect Look and Sound !!!

            Order arrived quick, goof by shipping company so i picked up kit at the hub, took to a buddys shop, with a lift and in 45 mins the transformation was done, can't decide if it looks or sounds better, Both are perfect. Nice deep tone, not to much.

            evo8080

            Year: 2009 Submodel: GT Concord NC

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            May 16, 2015

            Can't go wrong with Flowmaster

            I bought this axel back within a week of buying my 2010. The stock exhaust was way too quiet. I have no business working on cars but I banged the install out on ramps in my driveway no problem. The only reason it took longer than and hour was a had to remove and adjust a little bit. Good mean sound a little louder than stock. Not loud enough for my tastes (my old car had gutted cats and Flowmaster 40's) but I like my neighbors so....

            Vic

            Year: 2010 Submodel: GT Florida

            Helpful (9)

          • 4/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            May 14, 2015

            upgrade my Baby

            Nice could be a little louder lol, nice fit looks good, Sound great.

            Taz

            Year: 2010 Submodel: GT marion,ohio

            Helpful (9)

          • 4/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            February 06, 2015

            Great note, kind of a happy medium for volume

            Live in Southern Oregon so shipping took a while but that was expected. Got the car up on floor jacks and it was easy to remove the exhaust with the exception of the bolt above the mufflers. Not much room to work. When I went to swap the rubber isolators off the factory mufflers onto the American Thunders, I noticed the front hanger bracket welded to the muffler was facing the opposite direction compared to the factory muffler. I took it to a shop thinking they were going to have to cut it off and fabricate a new hanger and weld it on facing the right direction. Turns out I was wrong, it managed to work anyway. I wish the instructions or website would have addressed that. The shop got them installed and welded to the pipes in about an hour for $100.00 I honestly have no idea how anybody can get this done in their garage on jacks in an hour or less, I'm not buying it unless they aren't factoring in the time it takes to remove the stock exhaust. The AT's sound great, loud enough for me (46 years old) but I wouldn't have minded them being a touch louder. I do really like the deeper throatier exhaust note. With the windows down they sound awesome (louder and great note). With them rolled up, they're a little louder than stock but not by much. When down shifting and slowing down with the engine's compression, they occasionally have a flat sound to them - kind of hard to describe but it sounds wrong. I've only got about 30 miles on them so I'm assuming based on other reviews, that flat sound will go away after i get some more miles on them. Based on other reviewers complaints of the paint flaking off, I painted mine with a heat resistant paint. I went with aluminum colored paint but I wish I'd painted them black. You can see the bottom of the back side of mufflers from behind the car and the black would have hid the crummy welds a little better. The bad welds really do stick out with the silver paint. I like the looks of the tips with the rolled edges and the 4 inch diameter looks great. After I bought these axle backs, I listened to the cat back AT's on the website and they were probably more what I was looking for in terms of the sound. A little more aggressive sounding but still livable for everyday driving.

            DLux

            Year: 2006 Submodel: GT medford, OR

            Helpful (9)

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