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Flowmaster American Thunder Axle-Back Exhaust (05-09 V6)

Market Price $294.99 You Save 13% ($39.02)
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  • Item 18404
  • MPN# 17421

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    Features, Video & Details

    • Aggressive Flowmaster 60-Series Delta Flow Sound
    • Polished Stainless Steel 3.5" Tip.
    • Durable Aluminized Steel Construction.
    • Includes One Flowmaster Muffler
    • Fits 2005-2009 V6 Mustangs.

    Review & Installation Video

    Review & Install Video

    Flowmaster Sound . The Flowmaster American Thunder Axle-Back exhaust system will improve your 2005-2009 V6 Mustangs exhaust flow for an increase in power and a throatier muscular exhaust note with their patented chambered designed muffler.

    Quality Construction. Constructed from durable 2.5" 16 gauge aluminized steel tubing for it's corrosion resistant properties the Flowmaster axle back features a specialty 5" X 10" chambered 60 Series Delta Flow American Thunder muffler with a 3.5" diameter polished stainless steel tip for muscle car looks and sound. As an added bonus the tip is embossed with the "Flowmaster" logo for true custom styling.

    Fitment. This Flowmaster American Thunder Axle-Back exhaust system is designed to fit the 2005-2009 4.0L V6 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 Details

    What's in the Box
    • (1) Muffler assembly
    • (1) Exhaust Hanger
    Installation Info
    Tech Specs
    Axle-Back Exhaust Specifications
    Piping Material: Aluminized Steel Tip Material : Polished Stainless Steel
    Piping Size: 2.5" Tip Size: 3.5"
    Muffler Type: Chambered Fitment: 05-09 V6 Mustangs
    Will it fit my Mustang?
    • V6 - 05, 06, 07, 08, 09

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    18 Questions / 6 Answers

    Ask a Question

    I have a 2005 mustang and was wondering how do I install it??? Do I have to weld it??? Or what? Tia


    • The Flowmaster American Thunder Axle-Back Exhaust will simply clamp on to your exhaust. More details can be found in the install guide, linked below:

      Rob D

    Helpful (0)

    How can I hear the actual sound of the Flowmaster American Thunder Axle-Back Exhaust on the 2005 to 2009 Mustang V6? Is there a video to hear from Flowmaster? Thanks.


    • Flowmaster does have a video for their American Thunder Axle-Back Exhaust directly on their website, which I will link below:


    Helpful (0)

    Does this exhaust have an annoying drone sound to it or does it sound good while driving


    • The Flowmaster American Thunder Axle-Back Exhaust will have some cabin noise. It will absolutely sound great on your 05-09 V6.


    Helpful (0)

    It says the exhaust includes a hanger, I have a 2007 mustang and Im just changing the one exhaust to this , will I still need the hanger kit ?


    • It is still recommended to replace the hangers at the same time as there are more than one, it is not needed but is recommended.


    Helpful (0)

    Will this fit a 2004 V6?


    • The Flowmaster American Thunder Axle-Back Exhaust is designed specifically for the 2005-2009 Mustang V^ and will not fit a 2004.

      Rob D

    Helpful (0)

    Will this fit on a stock 05 mustang without any other items for it? I mean can it just go right on after taking off the stick muffler just as easy as that??


    • This Flowmaster American Thunder Axle-Back exhaust system is designed to fit the 2005-2009 4.0L V6 Mustangs for both great looks and great sound. No further parts would be need to install this axel back.

      Pat K

    Helpful (0)

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    Customer Reviews (100+) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:0-$100

    • Loudness / Volume 4.411765 4.4
    • Exhaust Note 4.605911 4.6
    • Fit & Finish 4.696078 4.7
    • Bang For Your Buck 4.666667 4.7

    • 5/5

      June 16, 2010

      Great Exhaust

      I was a little leary about buying this exhaust. I shouldn't have been. I installed it with every intention of putting the OEM back on if I didn't like it. I won't be taking it off. It gives my 09 Convertible V6 a nice rumble at idle, and you can really hear it during a quick acceleration. Once you reach your cruising speed its nice and quiet. Its not obnoxiously loud at all. I could feel the HP difference immediately. I have nothing bad to say about it and American Muscle delivered it quick. A BBK CAI is next. I hope this helps if your riding the fence.


      Year: 2009 Submodel: V6

      Helpful (35)

    • 5/5

      July 06, 2010

      Ohhhh Baby...

      My word... Got my car, a lovely 09 Mustang, and immediately started looking for a new muffler. Why? Because, the stock muffler STINKS! After a TON of research, I decided on this one. BEST CHOICE EVER! My parents actually bought it and my uncle installed it while I was on a trip. Came home late, cranked up my car, and paused... "Was that..." Looked around back and there was that pretty "flowmaster" chrome tip. It sounds amazing, and trust me, no video does it justice. It has a nice, deep sound. Doesn't "pop" much. Only does it when I start it, and even then only every so often. Muffler is definitely the first V6 mod you should do, and in my opinion, this one is by far the greatest!


      Year: 2009 Submodel: V6

      Helpful (28)

    • 5/5

      July 04, 2010

      It Sounds Awesome!

      i bought this flowmaster and it arrived in just 3 days. i had it professionally installed and it sounds amazing! it makes your v6 sound soo much better. Next year i plan on getting a true dual with both of these flowmasters on my mustang. i recommend buying this exhaust to get rid of the whiney sound of the stock muffler!


      Helpful (26)

    • 5/5

      September 08, 2009


      hey mustang lovers, after looking for weeks for an affordable exhaust system for my v6 stang, i found this. after reading some of the reviews i was skeptical. But i went out on a limb and i am so happy! i had it installed at 9 am this morning and i LOVE it. it sounds amazing when u turn it on and at idle. Acceleration- loud when u want it and soft when u dont. sorry about all the grammar mistakes on my review, im just so excited!!!! buy this product


      Helpful (16)

    • 5/5

      March 08, 2010


      Just got it today and installed it right away. it took me two days to pick the right exhaust that would give my v6 what it needed to sound the way it looks. Let me tell you this exhaust sounds great. The flowmaster give the mustang a deep rich sound when u hit the gas. Like another reviewer said i stop listening to the radio just so i can hear it. One bad thing ,well its not that bad but everyone on the road wants to race since i put it on. That is how good it sound. dont take my word go to youtube so you can hear it for yourself. Highly recommended.


      Helpful (15)

    • 5/5

      Installation Time: Less than 1 Hour

      September 20, 2011


      sounds amazing, good increase in HP, and looks great!! had it installed at a shop for $40 bucks and it only took them 30 min!!!


      Year: 2007 Submodel: V6 san antonio

      Helpful (12)

    • 5/5

      April 23, 2010


      I do all my mods to my car. This took me about an hour to install with the no power tools. I didn't get the extra $60 hangers and it is tightly in place in an 09 V6. Sound is so buff. I posted a video on YouTube if you doubt its buffness. Throttle response if ridiculously improved. I spent my Tax Refund well. :)


      Year: 2009 Submodel: V6

      Helpful (10)

    • 5/5

      Installation Time: Less than 1 Hour

      September 09, 2011

      Easy installation, great fit, and amazing sound!

      Highly satisfied! First mod done to my stang, easily installed in about 45 minutes, amazing sound especially in higher rpm's, and boost in power. I get alot more challenges to race ever since I got the exhaust and I'm happy to say my stock 210 hp v6 pony with Flowmaster exhaust took out an Infiniti G37 S. I highly recommend this product!


      Year: 2005 Submodel: V6 Los Angeles, CA

      Helpful (9)

    • 5/5

      December 03, 2010

      A wonderful product at a great price

      As a mustang V6 owner (2007) the first thing I wanted to do was get some bolt-ons. I looked at cold air intakes, exhausts, and chips. The first thing I decided to do was this flowmaster exhaust. I am very glad I did. The bolt on horsepower is noticable and the car sounds amazing. at idle the car sounds louder then stock with a deep growl. At about 2500 rpm the note gets really loud and deep sounding identicle to my friends v8 truck with an exhaust. this product will make your stang a lot funner to drive as well as turn some heads. I would buy this again as the first stang upgrade in a heartbeat


      Year: 2007 Submodel: V6

      Helpful (9)

    • 5/5

      Installation Time: Less than 1 Hour

      September 22, 2011

      This product has Excellent qualities!!!

      When i first installed it, just from the looks of it i knew that i qould like it. When you first crank the engine and it starts up man are you SURPRISED at what it actually sounds like. Everyone has heard a lions roar, well thats exactly what you get when you start it up. Idleing like at a stop light you dont hear it at all. But once you hit the gas even just the slightest you can hear and feel the growl throughout the car. All in all this is the best and first thing someone should buy for their Mustang.


      Year: 2009 Submodel: V6 Oklahoma City

      Helpful (8)

    • 5/5

      February 27, 2011

      I love this exhaust

      I love this exhaust. It was delivered quickly. I had it put on and it sounds great. The difference was instantly noticeable. The sound of the exhaust when I press the accelerator is so much better now. If you have a V6, this is a must have.


      Year: 2007 Submodel: V6

      Helpful (7)

    • 2/5

      Installation Time: Shop Install

      March 28, 2012

      Too Loud

      I debated buying this product for over a year because I did not want something too loud. I kept reading the review comments and finally made the purchase. Unless your 17 years old, it's too loud. Had it professionally installed and it looks great, but I will go back to the stock muffler.


      Year: 2007 Submodel: V6

      Helpful (6)

      • Response from AmericanMuscle

        We've heard that after a while of driving with this axle-back installed, the sound can change slightly. I'd recommend using it for a month or so to see if the tone/sound gets any better for you. If you still are unhappy after testing it out, give our experts a call and they'd be glad to help you find something to better suit your taste!

        Lisa, Content Specialist

    • 5/5

      May 31, 2011


      Install took about 1hr & I didn't even have to jack up the car. The muffler slid right in & the bolt up was a snap. I noticed an increase in highway gas mileage by about 1.5 mpg. The sound is great & its a major improvement from the stock muffler. (I'll take a Flowmaster over any other muffler anyday)

      Jeremy Truelove

      Year: 2006 Submodel: V6

      Helpful (6)

    • 5/5

      August 20, 2010

      A must have...

      I wanted a strong sounding, gurgly exhaust sound. I took off the stock exhaust and drove around with out a muffler for a bit for kicks. I loved that sound, but it was a bit loud. After putting on the flowmaster, i was suprised that the exhaust sounded even better, and the volume was still at a level where people will turn their heads when you pin it. When you lift off, the drone disappears. Sounds awesome on cruise control. Easy to install, only complaint is that the muffler gets VERY hot, and you can smell hot plastic, almost as if the bumper is about to melt, so dont get the tip too close to the bumper.

      Chris Al.

      Helpful (6)

    • 5/5

      April 18, 2010


      This is a must for any V6 Mustang. It definitely gives the car a headturning sound. I've been getting compliments on the car from total strangers ever since I put it on.


      Helpful (6)

    • 5/5

      March 07, 2010


      I was so nervous to purchase a new exhaust for my 2010 Mustang. I wanted to make sure it was going to have the sound I was looking for. I wanted my Mustang to have a rich deep growl to it...and let me tell you, this Flowmaster did NOT disappoint me at all. I took it down to my mechanic and he installed it within 15 or 20 minutes. I would highly recommend this product to any V6 Mustang owner out there. The sound is amazing. If you have any hesitations about this product you need not worry. You're going to love it. I used to be the type that would have to listen to the radio or a cd while driving but I haven't done any of that since I had this installed. I'm too busy listening to my Mustang GROWL!!!

      Jeanette G.

      Year: 2010 Submodel: V6

      Helpful (6)

    • 5/5

      August 12, 2011

      Let them horses sing!

      Just had my new Flowmaster American Thunder Axle-Back Exhaust installed on my '09 and it sounds amazing! I had a friend's teenage son install it and he said everything was easy except a pre-existing bolt on the factory exhaust that didn't want to come off. I bought the hanger kit too just to keep it all new and couldn't be happier. There is an instant growl upon ignition and at acceleration up until about 20-30 mph then it quiets down nicely. All in all, I think this is a great way to improve the sound of your V6 (it looks nice too) without the high cost of a dual exhaust.


      Year: 2009 Submodel: V6

      Helpful (5)

    • 1/5

      May 08, 2011

      my first mistake : too loud

      sometimes you make mistakes, and this one was mine. let's first say the quality of the product is not the cause : it's great, solid, perfect finish and manufacturing. Installation is way easier with car on a ramp (otherwise access under the car makes it difficult) It does was it is sold for : increase sound. But where some describe a non invasive noise level inside the car, it's not my opinion at all. Truly, it changes your stang, but in my case, i hated it and went back to factory muffler. As a daily driver in a city, the noise increase is mainly in the low rpms, constant and in the end annoying. dunno exactly if a V8 does the same from the inside, but a bit too loud for me. I guess it's just tastes and driving habits, and maybe you're less impacted if you're mainly a non city driver and more a highway one (as pass some rpms the noise level gets back to acceptable, that's true). So in the end it turns out a bad experience for me, but the product stays top notch quality. Just be aware that the noisier outside you will have higher engine noise level inside and you may not like it...


      Year: 2009 Submodel: V6

      Helpful (5)

    • 5/5

      November 17, 2009


      I love the sound of this muffler. mine doesnt sound as ricey as the one in the video though. sounds beastly for a v6. My dad says it sounds better then his v8s stock. i got the BBK CAI and it makes it sound cleaner i think.


      Helpful (5)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      June 14, 2012

      Great First Upgrade for the V6

      At first, I was suspicious as to whether or not this muffler would make any difference at all. But once the engine was turned on for the first time, it was amazing. It sounded like a GT! You can here it from blocks away. After having this item installed for a little bit over a month, I am safe to say that the sound is addicting. My son has been asking to go for a drive, EVERY SINGLE DAY! This is louder than a stock Camaro SS exhaust, and a Challenger R/T, and it turns heads, believe me. It adds really great horsepower and a decent amount of added gas mileage. I would definitely suggest this amazing thing to all of my fellow mustang v6 owners, its just something you need in order to get yourself out of the grandma v6 crew.


      Year: 2007 Submodel: V6 Chicago, IL

      Helpful (4)

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