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Ford Performance FR500S Axle-Back Exhaust (05-09 GT, GT500)

Market Price $629.99 You Save 13% ($80.02)
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  • Item 24084
  • MPN# M-5230-S

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Features & Details

  • Aggressive Throaty Exhaust Sound
  • Polished 304 Stainless Steel Tips
  • Durable Stainless Steel Construction
  • Fits 05-09 GT and 07-09 Shelby GT500 Mustangs
Aggressive exhaust note. The Ford Racing FR500S Axle-Back exhaust system will improve your 2005-2009 GT or GT500 Mustangs exhaust flow for an increase in power and a throatier exhaust note, than that of a stock GT.

Quality Construction. Constructed from durable aluminized 409 stainless steel for it's corrosion resistant properties the FR500S axle back features 3.5" diameter polished 304 stainless steel tips for muscle car looks.

Application. This Ford Racing Axle-Back exhaust system will fit the 2005-2009 GT and the 2007-2009 Shelby GT500 Mustangs for both great looks and great sound.

Fitment: 2005 2006 2007 2008 2009 Details

What's in the Box
  • (2) Muffler assemblies
Installation Info
Tech Specs
Axle-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished 304 Stainless Steel
Piping Size: 2.5" Tip Size: 3.5"
Muffler Type: Straight-through Fitment: 05-09 GT and 07-09 Shelby GT500 Mustangs
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09
  • GT500 - 07, 08, 09

People Who Bought This Item Also Bought

Most Helpful Reviews


Had these installed yesterday on my 07 Gt. They sound amazing! Nice growl when you open the throttle but not much louder than stock when your crusing. But if you step on it people will know this ain\'t ...

Read More
Helpful (12)

excellent !!!

I just put these on my 09 GT, had bullitt axlebacks on which sound great under acceleration but I wanted more sound just cruising. I also tried the pype bombs which were just way too loud, way to much ...

Read More
Helpful (9)

Overall Rating 4.9 out of 5 stars
Read All 100+ Reviews

Customer Photos (15) Submit Your Photo

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4 Questions / 6 Answers

Ask a Question

Does this Axleback system and the Borla ATAK Axleback have a similar volume or is one significantly louder than the other?


  • This exhaust and the Borla ATAK exhaust will have similar sounds as mentioned with our loudness meter on the axle-back exhaust page. However in direct comparison, the ATAK exhaust will be slightly louder as the muffler chamber is smaller in size and shape than that of the FR500S axle-back exhaust.


Helpful (1)

do these have the ford logo on them and are allowed in all 50 states


  • The Ford Performance FR500S Axle-Back Exhaust (05-09 GT, GT500) will not have the Ford logo on them. This is however CARB legal for all 50 states. However if you have questions about restrictions, contact your state DMV for further information.


Helpful (0)

can I install this exhaust on 2010 gt?


  • This Ford Performance FR500S Axle-Back Exhaust will only work with the 2005 to 2009 Mustang GT. You will want to look at our exhaust options for the 2010 Mustang GT. I will put the link below to all of your options for the 2010 Mustang GT.


Helpful (0)

how much hp Do these offer more horsepower then the stock ford racing exhaust on 2008 Bullitt?


  • Maybe 5HP


Show 2 more answers Helpful (0)

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Customer Reviews (100+) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

  • Loudness / Volume 4.54955 4.5
  • Exhaust Note 4.900901 4.9
  • Fit & Finish 4.63964 4.6
  • Bang For Your Buck 4.504505 4.5

  • 5/5

    June 13, 2009


    Had these installed yesterday on my 07 Gt. They sound amazing! Nice growl when you open the throttle but not much louder than stock when your crusing. But if you step on it people will know this ain\'t no stock mufflers. Great buy!!!

    Drew H.

    Year: 2007 Submodel: GT

    Helpful (12)

  • 5/5

    January 20, 2011

    excellent !!!

    I just put these on my 09 GT, had bullitt axlebacks on which sound great under acceleration but I wanted more sound just cruising. I also tried the pype bombs which were just way too loud, way to much drone at highway speeds, and got followed for awhile by the Sherrif. The FR500S system is just right, I recommend it- and fit and finish are top notch-

    Tom H.

    Year: 2009 Submodel: GT

    Helpful (9)

  • 5/5

    July 23, 2010

    exhaust in Canada

    got these shipped and picked up at a UPS depot on the border. I got them installed at shop....good thing as there was some torch work to get the stock stuff off. They fit great, are of excellent construction and sound fantastic. Great throaty sound on acceleration, but about the same as stock inside the car at cruising speed on the drone or resonance


    Helpful (9)

  • 5/5

    April 28, 2010

    FR500 exhaust

    Very awesome muffler system. Much louder than the sound sample online. Would definitely recommend these to anyone who is looking to get that raw muscle car sound.


    Helpful (8)

  • 5/5

    June 09, 2009


    These are great mufflers, installed them on my \'08 bullitt and love them. They keep my stock tips on them too so thats a plus


    Year: 2008

    Helpful (7)

  • 5/5

    May 05, 2010

    Awesome Growl

    Great muffler from Ford Racing, I agree sounds much louder than the online sample, A must have for any GT owner!

    Derek Hedrick

    Helpful (5)

  • 5/5

    October 03, 2009

    Great Rumble

    Got them installed on my '09 Bullitt. It has a very nice idle rumble and throttling roar. I don't know too much about other exhaust systems but I think this was well worth the money.


    Year: 2009

    Helpful (5)

  • 5/5

    April 13, 2011


    Super fast delivery within 5 days of ordering and installed in just an hour, the tips lined up perfectly no adjustments needed. I installed them on my 2006 Mustang V6 that previously had the FRPP dual exhaust with GTB mufflers, they are much much louder at WOT and passed 1500rpm, but under 1500 and idle they are very quiet and burble like an old muscle car would. My car is a daily driver but they are not loud or obnoxious at all at 60mph cruise or driving normally around town. my final verdict: the best mufflers EVER!!!


    Year: 2006 Submodel: V6

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    May 04, 2016

    What an improvement

    Just purchased my 08 GT500 and this was my first upgrade. I was apprehensive about going with these axle-backs but I'm so glad I bought them. No drone whatsoever and they aren't too loud at idle but when you give them some RPMs they really open up and sound incredible. Excellent product


    Year: 2008 Submodel: GT500

    Helpful (3)

  • 5/5

    Installation Time: Less than 1 Hour

    May 10, 2012

    Sounds Great!

    There's not much to say that hasn't already been said about these axle backs. Previous posts are correct in that it's harder to get the old ones off due to their size. Still super easy to install, they and fit perfectly. They sound amazing. There's a really nice growl on startup, they quiet down on idle (but louder than my stock GTB's), and at about 2500rpm, they really come alive. I had already installed the FRPP shorty headers with the FRPP cut & clamp x-pipe, and I couldn't be happier with this combination.


    Year: 2009 Submodel: Bullitt Longview, TX

    Helpful (3)

  • 5/5

    December 26, 2010



    Chris B

    Helpful (3)

  • 5/5

    December 05, 2010

    Awesome change

    I was amazed at the ease of installation and the feel of the car sound of a real stang. The car has made some heads turn as I accelerate to cruising speed. Pretty deep and smooth sound during cruising; however, the sound presents itself when you step on the throttle. Would definitely consider these an excellent replacement to the OEM Mufflers. These should be stock on all Mustangs.

    Jeff Hockenberry

    Helpful (3)

  • 5/5

    August 29, 2009

    09 Shelby gt500

    My friend has a KR and that is the sound I wanted,but having x pipes I was surprised that the sound was even better and no drone.Quality piece,easy install.I have dealt with American muscle before and the serviceis 100%

    Hank B

    Year: 2009 Submodel: GT

    Helpful (3)

  • 5/5

    Installation Time: Less than 1 Hour

    April 01, 2017

    Should be stock mufflers!

    I had a problem with my first box of mufflers, one tip was polished to a mirror shine and the other was a dull brushed finish. AM had me fixed up and new muffler in my hand withing two days. Absolutely unbelievable service from AM. With that out of the way, they mufflers fit almost perfect, one of the hanger rods is a littler short and need some tweaking, but it could also be that my car is now 9 years old. The stainless tips are very good quality, and the parts are all highest grade. These mufflers are loud, but won't rattle the windows of the house, there is zero drone, and at 60 MPH they basically go silent, which is perfect for commuting. The sound is intoxicating, I can't put it another way. All in all, these should be on every mustang.


    Year: 2008 Submodel: Bullitt

    Helpful (2)

  • 5/5

    September 08, 2016

    Loud when you want, quiet when you want, no drone!

    Just put these axle-backs on my 2007 GT (V8, manual) which is otherwise completely stock. Normally, I don’t recommend Ford after-market products as other companies just seem to do it better, but I have to admit the folks at Ford-Racing got it right this time. I was looking for the perfect combination of loud, but refined sound and tolerable everyday driving (without the neighbors hating me) and this hits the spot! I tried SLP Loudmouths and they were just annoyingly loud (might as well just cut off your exhaust with a chainsaw and let it rip). The sound was raspy, extremely noisy and had an annoying drone. I also tried the Borla Touring exhaust which by comparison was very quiet (no louder than stock) and also had a very noticeable drone. I have heard that the Borla ATAK and S-Type also have drone, and I’m here to say that the Touring also has drone. What I thought originally was a beefed up exhaust turned out to be a quiet rear with a buzzing cabin especially around 1,700-2,500 rpm. I was surprised because Borlas cost a lot of money. This review of course is just comparing all of these axle backs to stock with no other modifications done. Maybe if you add in a different H-pipe/x-pipe or headers it might sound different but just stock Borla axle backs drone a lot. Now there came the Ford Racing FR500S axle-backs. When you start them up they are loud. They will wake the neighbors up, HOWEVER, by comparison, when I cold-started my stock-muffler mustang it was loud and woke the neighbors up so you should not use that to make a decision because they are all loud at the start. After the FR500s’s run a while you start to hear their true beauty. A beautiful refined V8 rumble, slightly louder than stock but deep and throaty. Now, when you hit the gas up to 2,000 they are still quiet with just a very nice throaty v8 rumble (AND ZERO DRONE). Go past 2,000 and these things open up. It’s literally like they have a side vent or something. All of a sudden she comes alive and lets out this deep throaty roar. It’s a sound that says “I am a V8, don’t mess with me” but it doesn’t say “I’m a 17 year old trying to show off”. On WOT (wide open throttle) it’s just an awesome deep, throaty growl that will give you a lot of attention but you can always tone it down by keeping around the 2,000’s. Finally, all across the board NO DRONE!!!! ABSOLUTELY NONE!!!! I can’t believe it! I mean it is literally quiet in the cabin and the noise you hear is coming from the tips of the exhaust like it should. SO, in summary, I use this car for daily driving. I don’t have the luxury of having a weekend car. I wanted something I could push the pedal with and have people look at me, but also something that if a cop is driving behind me or I want to listen to music or talk in the car I could also do that. In the morning, I start the car in 2nd gear and roll out quietly and then let it warm up and she quiets down. Perfect daily driver that says I’m a mustang and no drone at all! Hope this helps. I spent A LOT of time watching videos online and went through these carefully selected exhausts so I am writing this honestly because I know how frustrating it is to get that perfect sound.


    Year: 2007 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    April 23, 2014

    The perfect mufflers for my Shelby

    After researching many mufflers I decided on the KR's (FR500S). Installation was straight forward and fairly easy. The driver's side rear hanger was a little more difficult than the passenger, but the install only took about an hour with a socket set. The tips on the mufflers are beautiful and the sound is exactly what I was looking for!! After hearing many mufflers on GT500s, I must admit that these sound the best to me. The fact that they are from Ford Racing is another plus.


    Year: 2009 Submodel: GT500 San Antonio, TX, USA

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    April 03, 2014

    Awesome Sound!

    This is a great product for sure. I installed them quickly and was very impressed by the sound and performance of the car. It is loud when you want it loud and zero drone when cruising at a normal RPM speed. I would recommend this product for any GT500 it really brings the car to life!!


    Year: 2007 Submodel: GT500 Oregon, USA

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    March 21, 2014


    Installed on a 2006 GT. Actual install took me about 1 1/2. My car only has 22K, so nothing was really bound up badly. The instructions posted on the AM product page were extremely useful! Followed them exactly and they were a great help. Only difference is the illustrated car is a bit different: the 06 only has two bolts on both center hangers (instructions had 3 on driver's side for an 08). Everything lined up pretty well. Sound difference was immediately noticeable from stock. Much deeper and pronounced. Car always sounded good at throttle, so even better now. And most importantly, NO DRONE. Had it out tooling at 60-70mph and no drone, just a nice low V8 sound. I spent the extra money to get a good exhaust and I'm glad I did. I titled this "M-5230-S" b/c that is the stock number on the box. From what I understand M-5230-S, FR500S, and "KR" mufflers are all the same. From what I've read, these are made by Borla but they had additional tuning done by Ford Racing, so not exactly the same. Very happy.


    Year: 2006 Submodel: GT Indiana

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    July 01, 2013

    FR500S axle-back: Bullitts should have been given these in the first place!

    Although I like the sound of the '08 Bullitt exhaust, it simply wasn't loud enough, and I constantly found myself in a lower gear--or just driving faster--just to hear the engine at speed. sadly, all I heard when driving on a highway in fifth gear was tire noise! The FR500S axle-back exhaust is an excellent alternative for '08/'09 Bullitt owners who want to keep the stereo off and enjoy some pony car music. The FR500S tips are identical to the Bullitt exhaust, and the cylindrical shape of the resonators fit the underside of the rear bumper perfectly. You can see the underside of the FR500S mufflers from the side of the car, but it is not unattractive IMO. If this is a dealbreaker for you, then consider Borla ATAKs. Furthermore, FR500S axle-backs make sense for S197 Bullitt owners, as these were installed on the GT500KR; adding FR500S mufflers to a Bullitt will complement the list of other GT500 items Ford put on the car (e.g., GT500KR rear axle, GT500 seats & steering wheel, etc.).


    Year: 2008 Submodel: Bullitt Charlottesville, VA

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    April 16, 2012

    Extremely Pleased

    Fantastic, great exhaust. This is the second Ford Racing Exhaust I have purchased and both times have been excellent. Fit and finish is superb, installation is a breeze. My brother and I changed the exhaust in my garage in less than an hour. Love the tone, awesome at WOT and no drone at cruising speeds. Highly recommend.


    Year: 2007 Submodel: GT Hillsboro, OH

    Helpful (2)

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