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

Item 23013
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    Features, Video & Details

    • Rich, Throaty Exhaust Sound
    • 3.5" Polished 304 Stainless Steel Tips
    • Fits 2005-2010 GT and Shelby GT500 Mustangs

    Review & Installation Video

    Review & Install Video

    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 - www.P65Warnings.ca.gov

    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?

      Customer Photos (88) Submit Your Photo

      View All 88 Photos

        Questions & Answers (49)

        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 (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)

        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 (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
        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
        Does this exhaust add any more horsepower or Torque? 1 answer

          Customer Reviews (100+) Write a Review

          Overall Rating 4.8

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:0-$100

          • Loudness / Volume 4.717213 4.7
          • Exhaust Note 4.769547 4.8
          • Fit & Finish 4.614754 4.6
          • Bang For Your Buck 4.631147 4.6



          • 5/5

            Installation Time: Less than 1 Hour

            October 31, 2019

            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.

            Anonymous

            Year: 2008 Submodel: GT

            Helpful (0)

          • 4/5

            Installation Time: Less than 1 Hour

            September 20, 2019

            Sweet!!!

            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.

            axton36

            Year: 2009 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            August 19, 2019

            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 :)

            MustangMan

            Year: 2005 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Less than 1 Hour

            August 13, 2019

            Just straight awesome

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

            AnimatedSky

            Year: 2006 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Shop Install

            July 31, 2019

            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.

            Darrell

            Year: 2007 Submodel: GT

            Helpful (0)

          • 4/5

            Installation Time: Less than 1 Hour

            June 20, 2019

            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.

            swolestang

            Year: 2007 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            June 17, 2019

            Love'm

            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....

            Dutch

            Year: 2007 Submodel: GT

            Helpful (0)

          • 4/5

            Installation Time: Afternoon

            June 13, 2019

            SLO loudmouths

            The exhaust sound nice but to had to modify it to fit in the passenger side took a while but the rest was easy 5 star for the way it sounds,3 stars for the quality

            Bigkev356

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            June 08, 2019

            Nice sound

            Very happy with this purchase. Fit/looks nice and sounds good.

            CF

            Year: 2006 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            June 05, 2019

            Violent

            I'm running this exhaust paired with an offroad x pipe and it is about as loud as you could imagine. Me personally, I love it, but if you aren't prepared for some rasp and an ear piercing exhaust note its not the one for you. Sounds like a NASCAR when you are at WOT.

            seanh

            Year: 2010 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            May 20, 2019

            SLP Loudmouth Exhaust

            What a great addition to the Mustang GT. Easy application and great sound!

            Brand

            Year: 2006 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            May 14, 2019

            slp exhaust

            The product looks good , installation was simple on the passenger side ,the drivers side was not as easy.The exhaust hanger rod would not line up with the factory exhaust hanger.I had to modify the hanger to make it work.Thank goodness I had a hoist.Once installed,it looks and sounds great.

            mike

            Year: 2007 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            May 01, 2019

            Great Looks and Sound

            My GT was missing the factory mufflers and exhaust tips when I bought it. It sounded great but was missing the tips. These eliminated the highway drone that I disliked by running the exhaust back out the back. They look great. They are aggressive when you give it the beans and moderate otherwise. Cold starts are aggressive. Most satisfying add on I have bought. Really great sound even with an otherwise stock exhaust.

            McIntosh

            Year: 2008 Submodel: GT

            Helpful (1)

          • 2/5

            Installation Time: Less than 1 Hour

            April 15, 2019

            Too Loud/Raspy

            This exhaust was a cheap fix to a problem when I bought the car. This exhaust was fun to play around with and you were almost always the loudest car on the road. The note is far too tingy and raspy when combined with my O/R X-pipe. Was way ready to get to a better more pretty sounding car that I didn't feel bad starting at night.

            KalvinG

            Year: 2009 Submodel: GT

            Helpful (1)

          • 4/5

            Installation Time: Less than 1 Hour

            April 11, 2019

            Style and Class

            The SLP Loudmouth axle-back exhaust is AMAZING! My car was kind of obnoxious with just straight pipes, but with the SLP Loudmouth pipes it still has an AMAZING sound but not is not obnoxious and it actually has a cleaner and more distinguished sound.

            JamesA

            Year: 2005 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Afternoon

            April 10, 2019

            SLP Loudmouths

            Install was easy, as I have a lift. Alignment was fairly easy, just don't tighten anything until perfectly satisfied. Fit and finish was great, and they sound awesome!

            JoelE

            Year: 2007 Submodel: GT

            Helpful (0)

          • 5/5

            March 29, 2019

            Axle back exhaust

            So far this is a good product ! I like the way it sounds and looks!

            GlennM

            Year: 2009 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            March 16, 2019

            Amazing sound

            Added a growl to the already good sounding engine. The perfect axle-back exhaust as long as you don’t mind a little drone

            ChanceY

            Year: 2008 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            February 18, 2019

            Sounds Nice, Easy Install

            If you watch youtube videos to reference the exhaust note, it's exactly what I wanted. Takes about 30 minutes to remove the old and install the new. No issues on fitment, and straightforward installation.

            BernardB

            Year: 2005 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            February 14, 2019

            Loudmouth is an understatement

            Buyer beware. These may be "loud" on a mildly modded car, but with a cam, LT headers, and a catted xpipe, they're downright obnoxious! And I love it. Cold start, they rumble and spit. After warming up...they calm down, until you mash the pedal. Pretty easy to scare the pants off the driver next to you on the highway. Not much drone, and actually pretty docile at cruising speed. Buy the hangar kit. I didnt, but will order today. Fit is just a tad off with the kooks xpipe. All in all, I love it. My wife....not so much.

            JohnW

            Year: 2006 Submodel: GT

            Helpful (4)

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