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

Market Price $497.99 You Save 13% ($65.02)
Our Price

$432.97 (pair)

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  • Item 18403
  • MPN# 17410

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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

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

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    13 Questions / 7 Answers

    Ask a Question

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

    corey3

    • 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.

      rabid37

    Show 1 more answer Helpful (1)

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

    RobertU

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

      AshleyK

    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.

    DaleA

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

      AshleyK

    Helpful (0)

    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.

    2008Pony23

    • The Flowmaster American Thunder Axle-Back Exhaust does come with a light powder coating on it that does hold just fine to high heat.

      SalC7

    Helpful (0)

    Do I have to buy the hanger kit or can I use my stock hangers and save the cash? Thanks.

    JC05GT

    • While the Flowmaster American Thunder Axle-Back Exhaust (05-10 GT, GT500) recommends the use of the SR Performance Stainless Steel Exhaust Hanger Kit (05-10 All) item #20021 http://www.americanmuscle.com/pypes-2005-stainless-hangers.html, it is not required. As long as your existing exhaust hangers are in decent shape you can use the ones on your Mustang. Hope this helps!

      KevinD92

    Helpful (0)

    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

    gzunlimited

    • The Flowmaster American Thunder Axle-Back Exhaust (05-10 GT, GT500) are sold as a pair. The price of $420.97 will be the price for both left and right mufflers.

      Ricky36

    Helpful (0)

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    Customer Reviews (100+) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:0-$100

    • Loudness / Volume 4.165217 4.2
    • Exhaust Note 4.596491 4.6
    • Fit & Finish 4.478261 4.5
    • Bang For Your Buck 4.587719 4.6



    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 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 (0)

    • 5/5

      Installation Time: Less than 1 Hour

      January 15, 2015

      install flow masters

      sound great/like very much,all product I got from you are always good

      taz23

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      December 01, 2014

      classic sound at good price

      give that classic flowmaster sound and note, with long tube the volume is perfect, not too loud when cruising but makes plenty of noise when wide open, have run long tubes with no mufflers and with factory mufflers, if factory volume is 1 and straight pipe volume is 10, these are about 4, highly recommend, easy install, perfect fit, 20 mins install on lift, 45 mins on ground

      fordtech2011

      Year: 2010 Submodel: GT south nj

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      December 01, 2014

      Easy job

      Easy to install if you have hanger brackets in correct position. Loosen the H-pipe to get tips centered. These mufflers look good and sound good and not overly loud. Nice tone going by on street. If you want loudness move on

      Kickinmg

      Year: 2007 Submodel: GT virginia

      Helpful (0)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      November 21, 2014

      exhaust

      Great sound. took awhile for droning to go but sounds better after a month or two.

      curty

      Year: 2006 Submodel: GT Elmira, NY, USA

      Helpful (0)

    • 4/5

      Installation Time: Less than 1 Hour

      May 29, 2014

      Mind your neighbors

      1st, I live in urban Los Angeles. My car is parked beneath some neighbors windows, so I didn't want anything that would wake them up, but more than that, I didn't want anything that would be annoyingly loud. That said, once I got these on, I wished they were a little louder. My car, performance wise, is totally stock otherwise, so maybe with a cai and tune they'll wake up, but more than likely I'll end up throwing an h-pipe on there as well. My lady friend couldn't even tell the difference. Wish overall it was a little louder throughout all the stages of idle, cruising, and gassing it. If you're looking for as loud as possible, without irritating the neighbors, there's probably a louder option.

      Earic23

      Year: 2006 Submodel: GT Hollywood, CA

      Helpful (0)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      May 24, 2014

      My stang is happy

      addition to my car...Hurst shifter,CAI JLT3,BAMA TUNEand now these FLOWMASTER and the sound my stang deserve.I smile everytime i move that shifter,GREAT BUY.

      gladiator

      Year: 2008 Submodel: GT Lévis, QC, Canada

      Helpful (0)

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