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

52 Reviews
Our Price

$422.95

  • Item #23042
  • MPN# M31023

  • Market Price $449.99
  • You Save 6% ($27.04)
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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 factory 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. Click here for details.

Mustang Fitment: 2011 2012 2013 2014 Details

What's in the Box
Hardware included: Hardware Included
  • (2) Clamps
Installation Info
Tech Specs
Axleback 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
Fitment
  • Boss 302 - 12, 13
  • GT - 11, 12, 13, 14
  • GT500 - 11, 12, 13, 14

Most Helpful Reviews View All

Overall Rating 4.7/5
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

Read More
Helpful (10) (1)

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) (1)

Customer Photos (11) View All

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Q & A (6 Questions, 5 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 Year: 2012 Model: GT

Question Resolved
Good Question (0) (0)
  • O absolutely! Any headers will compliment the sound of this exhaust.

    Helpful (0) (0)

    giosdad Year: 2006 Model: V6

Show 1 more answer

Will this kit and/or the Rousch axle backfit the 2012 Club America Edition? Comes epuiped with dual factory mufflers. Have the 2012 Mustang Club or America edition. It is a V-6 and want remove the dual factory mufflers and replace with either the SLP Loudmaouth or Rousch axle back exhaust systems.

haze Year: 2012 Model: Other

Question Resolved
Good Question (0) (0)
  • Yes the Club Am is only different trip package is an optional upgrade package for the V6 coupe or convertible which includes a billet style grille with tri-bar Pony badge, front lower fascia with fog lamps, 18 inch sterling gray metallic painted wheels, a unique side stripe, decklid spoiler, and Mustang Club of America front floor mats. I have thr Roush AB,,, OMG, it is hands down the best !!!!

    Helpful (0) (0)

    bobnjamie Year: 2012 Model: GT

    Top 250 Contributor

How much horsepower will this exhaust add?

Arthur91 Year: 2013 Model: GT

Question Resolved
Good Question (0) (0)
  • 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.

    Helpful (4) (0)

    Best Answer

    KenobiGT Year: 2008 Model: GT

    Top 100 Contributor

Show 1 more answer

Reviews (52) Write a Review

  • 5 Stars .79 79%
  • 4 Stars .13 13%
  • 3 Stars .06 6%
  • 2 Stars 0 0%
  • 1 Stars .02 2%
4.7

out of 5 stars

50 Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume: 4.888889 4.9/5
  • Exhaust Note: 4.681818 4.7/5
  • Fit & Finish: 4.288889 4.3/5
  • Bang For Your Buck: 4.488889 4.5/5
Filter By Sort By
  • 5/5 Yes, I recommend this product

    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 No, I do not recommend this product

    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

      I'd suggest taking this to a shop to find out if they are actually defective or if they can be bent a bit to fit better. I haven't heard of this issue previously and I'd like to be able to send you a replacement that fits as it should after we figure out the cause. Please give us a call so that we help you get this resolved!

      Lisa , Customer Care

  • 5/5 Yes, I recommend this product

    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 Yes, I recommend this product

    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 Yes, I recommend this product

    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 (4) (0)

  • 5/5 Yes, I recommend this product

    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 Yes, I recommend this product

    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 Yes, I recommend this product

    September 26, 2011

    YEEEEEEEESSSSSS!!!!!

    Took off the Stock 2012 GT/CS exhaust and What A Difference!!! My wife hates them, my son and friends love them!! :) SLP Loudmouth axlebacks are incredible, and I'm getting 2 extra MPG!!! Sounds fantastic, and looks awesome...I put the tips quite a bit further Aft and now it looks and sounds the way a mustang should.

    UB50

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Sumter SC

    Helpful (2) (0)

  • 5/5 Yes, I recommend this product

    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 Yes, I recommend this product

    June 08, 2014

    great choice

    I upgraded from an 07 gt to a 14 gt. I had an off road x pipe and flowmasters on my 07. it was loud! with my 14 I decided I was going to keep the cats on this time. this led me to research more aggressive axle backs. I went with the slp loudmouth because of the aggressiveness of the muffler delete. I chose the slp over magnaflow because they seemed to be of equal quality but slp was better on my wallet. I didn't want to waste my money on the heartthrob exhaust with the cheap materials it included. the slp fit perfect and looks great. the sound is amazing. somewhat calm at idle but starts to really growl at the slightest touch of the throttle and screams when its wide open. very happy with my purchase. If you want loud but want to stay street legal this is for you. Btw my buddy got the pypebomb and mine is def louder< especially when you get on it

    Rob14

    Year: 2014 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 3 Texas, USA

    Helpful (1) (0)

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