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SLP Loudmouth Axle-Back Exhaust (11-14 GT & GT500)

60 Reviews
Our Price

$422.95

  • Item #23042
  • MPN# M31023

  • Market Price $439.95
  • You Save 4% ($17.00)
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Product Videos Customer Photos
Features
  • Rich, Throaty Exhaust Sound
  • Muffler Delete
  • 3" Mandrel-Bent 409 Stainless Steel Tubing
  • 4" Polished 304 Stainless Steel Tips
  • Emissions Legal in All 50 States
  • Fits 2011-2014 GT and GT500 Mustangs
Description


Aggressive Throaty Exhaust Note. This SLP Performance Parts Axle-Back kit eliminates the restrictive stock mufflers from the 2011-2014 GT or GT500, drastically reducing back pressure to enhance power and to produce one of the most aggressive exhaust notes possible with the factory catalytic converters still installed.

409 Stainless Steel. SLP's Loud Mouth axle-back system is made from 3" mandrel-bent 409 stainless steel tubing, which has excellent flow characteristics and features pre-welded hangers for simple installation. The hand polished, 4" dual wall tips give a show quality muscle car appearance to the rear of your Pony.

Application. Made as a direct bolt on, this SLP Loudmouth Axle-Back bolts right up in the stock location without any modifications required on the 2011-2014 GT or 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: 2011 2012 2013 2014 Details

What's in the Box
Hardware included: Hardware Included
  • (2) Clamps
Installation Info
Tech Specs
Axle-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished 304 Stainless Steel
Piping Size: 3" Tip Size: 4"
Muffler Type: None Fitment: 2011-2014 GT and GT500 Mustangs
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • GT - 11, 12, 13, 14
  • GT500 - 11, 12, 13, 14

Most Helpful Reviews

5/5
Simply Outstanding

After the first 30 minutes of having it installed, I was complimented by 3 random people. It is a very noticeable difference from the stock exhaust. I love the sound of it when you get on it. Very loud ...

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Helpful (10)

5/5
AWESOME!!!

HOLY CRAP is all I have to say!!! I've owned 2 mustangs and the other one had the pype violaters on my 2010 4.6L, Now I have a 5.0 with these SLP's and OMG!!! Night and DAY DIFFERENCE. I've had 4 people ...

Read More
Helpful (8)

Read All 60 Reviews
Overall Rating 4.7 out of 5 stars

Video

Customer Photos (12) View All Photos

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7 Questions / 7 Answers

Ask a Question

will this exhaust sound better with 1-3/4" SLP long tube headers? I am for sure wanting to buy the SLP Loudmouth Axle-Back, but i would like to give it an even rawer mustang sound. i was wondering if that would work or if there was something a little less expensive that would accommodate for the same thing.

stang1195

  • O absolutely! Any headers will compliment the sound of this exhaust.

    giosdad

    Good Answer (0) (0)

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How much horsepower will this exhaust add?

Arthur91

  • An axle back exhaust kit will not add very much horsepower, as the benefit of mandrel bends and larger diameter tubing is so close to the actual exhaust exit. This kit will be mainly an exhaust note upgrade that may or may not free-up an additional one or two horsepower. You're basically buying a more aggressive sound.

    KenobiGT

    Good Answer (4) (0)

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Will this be LOUDER and/or DEEPER than the Outlaw Axleback I currently have the Outlaw Axleback installed on my 2011 5.0 with a resonator delete. Will switching to the SLP make it MUCH louder? and will it be deeper? because the Outlaws are loud, but not loud enough for me. and I really want a louder exhaust and can't decide on which one to get. So please help me out! thanks

Marco93

  • Would be loader since you are deleating the mufflers but youre not going to be much deeper, to accomplish that you're going to want to look in to an exhaust system (like a cat back system) but in short you're car will be louder but to accomplish a real mustang tone look at American muscles selection of catbacks there well priced> good luck

    Barricade24

    Good Answer (1) (0)

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Customer Reviews (60) Write a Review

Overall Rating 4.7

out of 5 stars




  • 5/5

    December 14, 2010

    Simply Outstanding

    After the first 30 minutes of having it installed, I was complimented by 3 random people. It is a very noticeable difference from the stock exhaust. I love the sound of it when you get on it. Very loud and will surely turn heads.

    Brett H.

    Driving Style: Daily Driver

    Helpful (10) (1)

  • 1/5

    Installation Time: Afternoon

    December 11, 2012

    Sounds great, fit is lacking

    Sounds awesome, had these as well on my 2009 GT/ Was extremely excitied to install, only to see they do not fit very nicely on a 2013.....they dont sit flush or centered in the openings, I messed with it trying to get it to fit better, but the way the hangers are on make it impossible to re-arrange. Sounds good, but if you care about your car's looks I'd go with something else. These will be gone as soon as I can afford a different set.

    hastethedav

    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Los Angeles

    Helpful (6) (0)

    • Response from AmericanMuscle

      Lisa , Customer Care

  • 5/5

    April 09, 2011

    AWESOME!!!

    HOLY CRAP is all I have to say!!! I've owned 2 mustangs and the other one had the pype violaters on my 2010 4.6L, Now I have a 5.0 with these SLP's and OMG!!! Night and DAY DIFFERENCE. I've had 4 people ask me if I took the cat's off or put headers on. When I told them nope its just axle-backs, they said HAHA Yah right... Haha!! WOOH This is the best sound upgrade for this car for the price FIVE STAR!

    Edison

    Year: 2011 Model: GT Driving Style: Daily Driver

    Helpful (8) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    January 27, 2012

    Awsome Sounding

    2011 5.0, Manual, 3.73's. It took me and friend about 1 hour to unbolt factory mufflers and install SLP's. SLP's fit right up and positioning them was no problem. Tips look huge compared to stock. Fired the car up, 3 neighbors came out to see what the noise was. The SLP's are LOUD and THROATY, just the sound I wanted. Sound at cruise is moderate, there is drone at 65mph in 6th, goes away at 70 mph, WOT is SICK!!!! There is no video clip that you can listen to that does these things justice. Highly Recommend.

    bushmaster6

    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Gilbert, AZ

    Helpful (5) (0)

  • 5/5

    Installation Time: Shop Install

    March 04, 2012

    Get This

    Very Aggressive Note but sounds great. I got this for my 2012 GT the week after getting my car. Soooo glad I did. I had a guy in a GT500 track me down and pull me over after passing him at an intersection. He wanted to know what exhaust I had so he could get the same and was surprised it was just an axleback.

    CJ50

    Year: 2012 Model: GT Driving Style: Daily Driver Tampa, FL

    Helpful (4) (0)

  • 5/5

    May 24, 2011

    SLP Loudmouth

    Easy install. Didnt even lift the car. Stock mufflers a little tough but I was on my back and the car was not lifted at all. Huge sound difference!! If you want loud, buy this exhaust. Hope to add BBK long tubes and off road X next.

    Chris

    Year: 2011 Model: GT Driving Style: Show

    Helpful (3) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 06, 2012

    Sounds good.

    I was worried about having it being raspy but it wasn't at all. This is how is should have came from the factory. Sounds good!!! Hardest part of install is removing the stock mufflers, after that it's cake. If you decide to go with an off road H-Pipe I recommend leaving the factory resonators on. True Story.

    Dude

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Dallas

    Helpful (2) (0)

  • 5/5

    February 08, 2011

    Slp 2011

    The product was simple to install took me 25 minutes. Works wonders for the 2011 best bang for the buck

    Ashton Slaughter

    Year: 2011 Driving Style: Daily Driver

    Helpful (2) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    February 21, 2016

    Everything I hoped it would be

    I'm never satisfied with a stock exhaust, even though the Shelby has a great exhaust note from the factory. Basically I was looking to keep the rumble and pop of the stock exhaust and just knock it all up a few decibels, and that's exactly what the SLP Loudmouth did for me. A local shop did the install in about an hour and everything fit with no issues. The longest time was removing the original mufflers. On the initial fire up, I knew I made the right choice. It really comes alive after 3K on the tach, and it's very attention getting. Since mine is a convertible, I get an even better dose of the exhaust note behind my ear, so I can truly say that with the stock exhaust I didn't always hear it, but now it is always audible. This is a cost effective solution for getting more attention. I had numerous people on the very first day making head turns and making compliments. Highly recommended! Thanks again to AM!

    Ratedrsuperstar

    Year: 2011 Model: GT500 Driving Style: Street / Strip 'Stangs I have owned: 3 Columbus, GA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    January 14, 2016

    sounds like thunder- the best!

    the install was an easy drop in and "bolt on" took about 40 mins to do - it was fairly straight forward and honestly you cant get a better sound from any other axle back than this one. NO raspy kick back - drone is only present during RPM build up (2200 rpms or so) in 6th gear its super quiet. Id suggest NOT cutting off teh resonators. It doesnt add any more hp or TQ and it will cause ALOT of drone and vibration if you do.

    Shawn

    Year: 2014 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Stockton, CA

    Helpful (1) (0)

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