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

Item 23013
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      Review & Installation Video

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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

      MPN# M31014

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 100+ customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • February 11, 2020

        5 2008 GT - Rc55 Installation Time: Less than 1 Hour

        Slp loudmouths

        They went on easy and sound great. Has catted x pipe and the SLP nice sound. Haven't driven much since install. Ohio weather.

        Helpful (0)
      • January 16, 2020

        5 2010 GT - Angel2010 Installation Time: Less than 1 Hour


        Sounds amazing. I always look forward to cold starts in the morning

        Helpful (0)
      • December 02, 2019

        5 2006 GT - JamesB Installation Time: Less than 1 Hour

        Nice sound

        Good product but hangers need an adjustment to work correctly

        Helpful (0)
      • October 31, 2019

        5 2008 GT - Anonymous Installation Time: Less than 1 Hour

        SLP Loudmouth Axle Backs

        For the price this will definitely not disappoint you. There is a little drone but overall it’s worth it specially if you know your getting into modifying your car.

        Helpful (0)
      • September 20, 2019

        4 2009 GT - axton36 Installation Time: Less than 1 Hour


        Love them! Totally changed the sound of my car. A nice deep rumble with a lot of popping and cracking on deccellaration. They sound great. I recommend.

        Helpful (1)
      • August 19, 2019

        5 2005 GT - MustangMan Installation Time: Afternoon

        Minor Fitment issue

        I recently installed these on my 2005 GT and they sound amazing. There was a small fitment issue that involved needing to grind 1/32 of an inch of the passenger side mid pipe. (Only added 15 minutes) other then that it was an easy install. And my mustang finally sounds mean and aggressive :)

        Helpful (1)
      • August 13, 2019

        5 2006 GT - AnimatedSky Installation Time: Less than 1 Hour

        Just straight awesome

        It’s as loud as I could ever want without getting pulled over, easy to install and sounds awesome

        Helpful (0)
      • July 31, 2019

        5 2007 GT - Darrell Installation Time: Shop Install

        I love my loud mouths

        2007 4.6 sounds great, would highly recommend them ! If you want attention with your car these are the ones.

        Helpful (0)
      • June 20, 2019

        4 2007 GT - swolestang Installation Time: Less than 1 Hour

        Sounds and looks good,not too loud

        install was super easy. i have a bunch of bolt ons and long tube headers. These sound great,great tone. I thought they would have been a bit louder tho.

        Helpful (0)
      • June 17, 2019

        5 2007 GT - Dutch Installation Time: Less than 1 Hour


        HAd these on my 08 and got raves going down the road so when i bought an 07 conv. i added them this this car too.... installed myself.... in 40 minutes on my coffee break so easy....

        Helpful (0)

      Questions & Answers (50 answers)

      5 Top Rated Questions

      What’s the difference between these and the mbrp muffler deletes? I have a xpipe on my car and can’t decide which of the 2 to get?

      • MBRP muffler deletes, like these Loudmouth muffler deletes, do not have any muffler or "muffling" on the setup. The biggest difference will be in looks from tip design.

      Helpful (4)

      Is the Flowmaster Outlaws louder than the SLP Loudmouths, and how much louder 1-10.

      • The SLP Loudmouth will be louder than the Flowmaster Outlaws by a small, but noticeable margin. The SLP will be a muffler delete whereas the Flowmaster uses a glasspack style muffler.

      Helpful (2)

      Do these comes with clamps for install?

      • Yes, the clamps necessary for install are included.

      Helpful (1)

      Right now, I have a muffler delete axle back. I want it to be a little quieter and more controlled so it doesn’t sound like a diesel truck. Will these make it a little quieter than a muffler delete?

      • This is also a muffler delete, l would not expect a drop in volume if installing these.

      Helpful (1)

      Are these loudmouth's really loud like would they i enjoy them until i do my midpipes

      • Yes, these will be much louder than the factory exhausts. 

      Helpful (1)
      10 More Questions
      I have a 2007 Saleen H281 heritage V8 mustang. Will this fit? 1 answer
      If I have a dual exhaust 07 v6 will this still ? 1 answer
      So to install I just remove the factory mufflers and installing the SLP Loudmouth Axle-Back Exhaust right? There is nothing else I need to do? 1 answer
      I’m currently running jba shorty headers,catless,pypes x-pipes and flowmaster resonators and no muffler. Debating whether if I should go with the pypes muffler delete or slp. What would be the difference between the two And Will the slp be too loud or will the resonators keep them a down a little? Thanks 1 answer
      How many decibels is the SLP loudmouth? I wanna know if it is legal in the state of Pennsylvania. 1 answer
      Are the Slp loudmouths the loudest exhaust? If they are not the loudest exhaust then what is? 1 answer
      I have a 07 Shelby GT with a kenne bell supercharger, will this exhaust effect any power gains? and will it effect my supercharger at all? 1 answer
      Will these mate up to Flowmaster Outlaw catback over-axle pipes? 1 answer
      Will these axle back bolt up to say the pype-bomb super system cat-back exhaust? And would the mid-muffler design affect the sound of the SLP's? 1 answer
      Will this fit the pypes cut and clamp x-pipe on a 2008 Mustang V6? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • (4) Four Clamps

      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

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