Talk to a Mustang Expert
Mon-Thu 8:30a-11p, Fri-Sun 8:30a-9p

Free Shipping on Everything. Seriously. Details

SLP Loudmouth Axle-Back Exhaust (05-10 GT, GT500)

100+ Reviews
Our Price


  • Item #23013
  • MPN# M31014

  • Market Price $376.95
  • You Save 4% ($15.00)
In Stock Ships same business day. Choose options to add to cart
Free Shipping on Everything
Customer Photos
  • Rich, Throaty Exhaust Sound
  • 3.5" Polished 304 Stainless Steel Tips
  • Fits 2005-2010 GT and Shelby GT500 Mustangs
Super Aggressive Exhaust Rumble. This SLP Performance Parts Axle-Back System eliminates the restrictive factory mufflers entirely from the 2005-2010 Mustangs, drastically reducing back pressure for enhanced power and aggressive sound.

Rugged, Durable Construction. SLP's Axle-Back system is made from 2.5" mandrel-bent 409 stainless steel tubing, which has excellent flow characteristics and features pre-welded hangers for simple installation. The hand polished, 3.5" dual wall tips give a show quality muscle car appearance to the rear of your Pony.

Application. The SLP Loudmouth Axle-Back is designed to fit the 2005-2010 GT, 2008-2009 Bullitt, and 2007-2010 Shelby GT500 Mustangs.

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
Hardware included:
  • (4) Four Clamps
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 / Resonator Fitment: 2005-2010 GT Mustangs
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10
  • GT500 - 07, 08, 09, 10

Most Helpful Reviews

Thunder from your pipes!

Really opens up the note from stock or even an aftermarket setup. 3~4k rpm sounds like god letting one rip after chilli night!

Helpful (3)

A Monster

SLP Loudmouths are the meanest exhaust for a 05-08 Mustang period. At idle they sound mean. At cruising speeds they sound mean. At wide open throttle they sound like an animal. I have heard Mustangs with ...

Read More
Helpful (2)

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

Customer Photos (66) Submit Your Photo

View All 66 Photos

You Might Also Like

13 Questions / 5 Answers

Ask a Question

What else do I need to put these on my 08 v6 mustang? I was thinking about getting a Pypes cat back exhaust system with out the mufflers and put these on. Are you guys selling any h-pipes or any materials that will let me use these? Dont want to buy from another site.


  • In order to use these SLP Axle-backs, you will need a conversion kit; we have two easy options for you! You can purchase the Pypes True Dual Exhaust X-pipe Kit, please see the link attached below. This kit allows you to reuse your stock catalytic converters and use any GT Axle-back of your choice. If you wanted a kit with high flow cats included, you could install the BBK True Dual Exhaust Conversion Kit, also shown below, and use the GT Axle-back of your choice. Hope this helps!


    Good Answer (1) (0)

Question Resolved

what do i need for an SLP loundmouth exhaust set up? i have a 06 gt mustang but i want something to really make my mustang sound mean. if i bought the SLP Loundmouth Axle-Back exhaust an went with a SLP catted X-pipe what eles would i have to buy?


  • I have the SLP Loudmouths on my 05 GT with the stock cats and H - Pipe and the car sounds like a beast! I love these mufflers. They have the best low throaty rumble in my opinion, and when you open her up they ROAR! In all honesty, these mufflers are ALL you need for one mean sounding 'stang. You WILL NOT be disappointed with the setup you mentioned, as long as you like loud, mean, and slightly obnoxious muscle car rumble!


    Good Answer (1) (0)

Show 1 more answer Answer This Question I need this answered (0) (0)

Will this fit a 06 V6 with a Dual exhaust on it I have the Pypes mid muffler exhaust on my V6 mustang. Will this work with that exhaust. If it was to fit. How would it sound?


  • Yes, it will fit with a Pypes mid exhaust. Should sound awesome! Loud.


    Good Answer (0) (0)

Show 1 more answer Answer This Question I need this answered (0) (0)

More Products You Might Like

Customer Reviews (100+) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume 4.804878 4.8
  • Exhaust Note 4.796748 4.8
  • Fit & Finish 4.658536 4.7
  • Bang For Your Buck 4.577236 4.6

  • 5/5

    July 21, 2011

    Best buy for your money

    Installed this last night on my 2010 GT and for two people who haven't played with exhaust systems before, it went pretty smooth. Had a little trouble lining up the driver side but passenger went smooth. The sound is amazing.

    Rich Siemienkowicz

    Year: 2010 Model: GT Driving Style: Daily Driver

    Helpful (2) (0)

  • 5/5

    March 01, 2010

    Thunder from your pipes!

    Really opens up the note from stock or even an aftermarket setup. 3~4k rpm sounds like god letting one rip after chilli night!

    Mike K

    Helpful (3) (0)

  • 5/5

    July 26, 2008

    A Monster

    SLP Loudmouths are the meanest exhaust for a 05-08 Mustang period. At idle they sound mean. At cruising speeds they sound mean. At wide open throttle they sound like an animal. I have heard Mustangs with Borla, Flowmaster, and even Magnaflow and they dont even come close to the SLP Loudmouths. If you have a stock GT and your planning to add some high performance goodies to your car, then the SLP Loudmouths are the perfect start. I paid about $340 for them, but I would have paid up to $600 for them I am so happy with this product. and SLP are the best!

    David Barnes

    Helpful (2) (0)

  • 5/5

    May 26, 2010

    2010 GT w/ SLP

    Very loud when you step on it but I also passed a couple of police roadblocks with SLPs and they didn't say a word. It truly depends on how you drive. But even when it is quiet it really sound powerful and growly. I'm entirely satisfied with the sound, the delivery and how easy it was to install. I recommend this to any stang addict who'd like a muscle car tone.


    Year: 2010 Model: GT

    Helpful (30) (1)

  • 5/5

    May 28, 2010

    SLP 2008 GT

    After doing extensive research into what axle back exhaust to get I finally decided on the SLP Loudmouths. This Truly brings out the sound of your V8. Not to say the stock mufflers were bad, but after hearing these things, I don't think I will ever go back. Before it purred, now it spits and pops. Once things heat up it really isn't obnoxiously loud. You can hear it faintly as you cruise down the road, but put your foot into it and watch out! You will not forget they are there! Install was easy. I didn't even have to jack the car up. It might be slightly easier if you do but it's not required. You will notice it is easier to put the SLPs on than it is to take the stock ones off. Alignment can be a little tricky. Make sure you don't tighten everything but rather have it lose so you can position things correctly the first time through. Steve McQueen would be proud of these!

    Douglas Kirk

    Year: 2008 Model: GT

    Helpful (32) (3)

  • 5/5

    April 27, 2010

    2007 Shelby GT500

    I hesitated buying these because I thought they would be to loud, but I'm glad I got them. Not only is the sound just awesome, but it's not obnixious loud like I originally thought. Don't get me wrong they are loud but it's not to much. Chances are if your looking for an exhaust you trying to increase the sound and this is the one you need. Very raspy deep tone and I can tell you first hand it will turn heads. This exhaust will transform the attitude of your ride. Installation was a breeze, however it does take a little bit of time to get them just right.


    Year: 2007 Model: GT

    Helpful (42) (6)

  • 5/5

    May 12, 2009

    Beast Maker

    Hands down a fast way to make your Stang sound like a Stallion on Roids. Order it on the 11th got it on the 12th. Forty five minutes later i am making ricers cry.


    Helpful (25) (4)

  • 4/5

    August 04, 2010

    2010 Mustang GT

    Just finished installing my Loudmouths. Installation took a little longer than anticipated because a couple of the exhaust hanger bolts were apparently crossthreaded from the factory. When I went to back the bolts out they were binding and I knew they were crossthreaded. Upon reinstallation of the bolts, they would spin out and could not be torqued down tightly. If this happens to you, a little Loctite Thread Locker will fix the problem. You may also need to grind a quarter to half inch off of the driver side exhaust tip hanger rod. The rod is a little long and will touch the rear bumber frame thus preventing the proper extension of the tip through the rear plastic fender exhaust cutout. Delivery was lightning quick - ordered them on a Sunday and received them Tuesday afternoon! The Loudmouths sound great !


    Year: 2010 Model: GT

    Helpful (8) (4)

  • 5/5

    March 25, 2010

    The Exhaust from the MUSTANG GODS!!!

    If Jesus Christ had a Mustang these are what he would have on it! Amazing sound and LOOOOUUUUDDDDDD! You can hear me coming before you see me and when im gone its like i never left the parking lot!

    Adam DeWitt

    Helpful (17) (4)

  • 5/5

    Installation Time: Less than 1 Hour

    May 22, 2012


    At first i was hesitant about buying these, i thought they would be too loud inside the car and get annoying at times, but honestly, its not obnoxiously loud inside unless you have the windows down, and it has a great tone to it. I listened to so many youtube videos on this exhaust, but in real life it sounds 100 times better than any video can make it sound!


    Year: 2007 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 New Jersey

    Helpful (8) (0)

Related Mustang Categories