(approx) 1 Hour
Light to Moderate mechanical skill required.
$448.95 (pair)FREE Shipping
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.
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Features, Description, Reviews, Q&A, Specs & Installation
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
CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
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.Helpful (1)
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,Helpful (5)
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.Helpful (5)
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....Helpful (7)
May 22, 2018
Much better than what I had on the car little louder than stock.fit right up with stock hangers. Much better exhaust note.Helpful (8)
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!Helpful (11)
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.Helpful (9)
December 08, 2017
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.Helpful (8)
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.Helpful (9)
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.Helpful (7)
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.
will this work? if i convert my v6 07 mustang to the duel exaust will these work/will any other GT mufflers work?
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.
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.
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.
The Flowmaster American Thunder Axle-Back Exhaust does come with a light powder coating on it that does hold just fine to high heat.
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!
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.
just had the flowmasters installed in a 05 auto,convertible they sound great
Works on my '09 GTCS. Sound great!
none that i can tell, but it sure sounds like it does.
Under hard throttle it's aggressive, cruising it's mellow but, ever present.
YES! I was shocked by how loud it is, after break in you will be pleased
We do ship to the US and Canada. If you want, you can give one of our Mustang Experts a call anytime at 866-727-1266 during our business hours and they'll hook you up! We also make it easy for you by including customs and taxes pre-paid so that you don't have to worry about getting hit when it arrives! I have the same Flowmaster Axle-Back on my 07 GT. There's something about the classic Flowmaster sound on a Mustang that you can't beat!
(approx) 1 Hour
Light to Moderate mechanical skill required.
What's in the Box
|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|