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

100+ Reviews
Our Price


  • Item #23013
  • MPN #M31014
  • Market Price $399.99
  • You Save 8% ($30.00)
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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 kit 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. Click here for details.

Mustang Fitment: 2005 2006 2007 2008 2009 2010 Details

What's in the Box
Hardware included:
  • (4) Four Clamps
Installation Info
Tech Specs
Axleback 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
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10
  • GT500 - 07, 08, 09, 10

Most Helpful Reviews View All

Overall Rating 4.9/5 Write a Review
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

Read More
Helpful (30) (1)

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

Read More
Helpful (42) (6)

Customer Photos (63) View All

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Q & A (9 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.

tcharvey7 Year: 2008 Model: V6

Question Resolved
Good Question (0) (0)
  • 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!

    Helpful (0) (0)

    LisaS Year: 1992 Model: GT

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?

1mean06 Year: 2006 Model: GT

Question Resolved
Good Question (0) (0)
  • 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!

    Helpful (0) (0)

    XeroVolume Year: 2005 Model: GT

Show 1 more answer

Exhaust hangers If you chose the hanger option does it come with all 4 or just 2.

jay600 Year: 2005 Model: GT

Question Resolved
Good Question (0) (0)
  • Just the rear two.

    Helpful (0) (0)

    NateDawg81 Year: 2008 Model: GT

    Top 500 Contributor

Show 1 more answer

Reviews (100+) Write a Review

  • 5 Stars .91 91%
  • 4 Stars .07 7%
  • 3 Stars .02 2%
  • 2 Stars 0 0%
  • 1 Stars 0 0%

out of 5 stars

100+ Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume: 4.836538 4.8/5
  • Exhaust Note: 4.826923 4.8/5
  • Fit & Finish: 4.615385 4.6/5
  • Bang For Your Buck: 4.538462 4.5/5
Filter By Sort By
  • 5/5

    2010 GT w/ SLP

    May 26, 2010

    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

    SLP 2008 GT

    May 28, 2010

    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

    2007 Shelby GT500

    April 27, 2010

    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

    Beast Maker

    May 12, 2009

    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)

  • 5/5

    The Exhaust from the MUSTANG GODS!!!

    March 25, 2010

    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


    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)

  • 5/5


    August 22, 2010

    Just installed the loudmouth today. Had to wait eight days for shipping because I live in canada but it arrived hastle free. Install took around two hours for me, could be done in less for the experienced wrench man. It was easy and when I fired it up ohhhh man it sounds sweet. Just a note if your picky like me you should start with the drivers side first as it helps with alligning the fitting for the other side so they both stick out the exact length. Such a great product and really makes you feel like your driving a muscle car. Now I need more thanks AM

    Josh B

    Helpful (11) (3)

  • 5/5

    This product has a great sound.

    September 21, 2011

    The SLP Loud Mouth exhaust has a great sound if you like the old school muscle car sound. The install was easy and the fit and finish was excellent but I highly suggest the following the instructions and not tightening everything up till last for adjustments.



    Year: 2007 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Charlotte, NC

    Helpful (5) (0)

  • 5/5

    05 Mustang GT

    February 11, 2011

    Rsearched exhaust on this website for many months and couldn't make up my mind...finally i pulled the trigger and bought SLP loudmouth and boy did i make the RIGHT Mustang sounds awesome...has the growl i was looking for...not to mention the amount of people who stop and stare as i go by...if you like attention this is the exhaust for you...easy to install...took about an hour....thanks american muscle...

    Joe V

    Year: 2005 Model: GT Driving Style: Daily Driver

    Helpful (4) (0)

  • 5/5

    Extremely easy installation.

    January 31, 2012

    I listened to the online sound bites several times. I read most of the reviews and picked these exhaust pipes. The reviews were very helpful. I had to cut about an inch off the hanger on one side (as I had read in the reviews). I also followed anothers advice regarding connecting it all, but not tightening the clamps UNTIL I was satisfied with the alignment. GREAT PRODUCT, AWESOME SOUND ! I had a 2011 - 5.0 pull up beside me at a light and tell me that it sounded GREAT !


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 South Carolina

    Helpful (3) (0)

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