Talk to a Mustang Expert
1-888-332-7930
M-F 9-9,Sat 9-5:30,Sun 12-4 ET

Free Shipping on Everything. Seriously. Details

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

53 Reviews
Our Price

$422.95

  • Item #23042
  • MPN# M31023

  • Market Price $449.99
  • You Save 6% ($27.04)
In Stock Ships same business day. Choose options to add to cart
Free Shipping on Everything
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.

Fitment: 2011 2012 2013 2014 Details

Won't fit? Add an exception

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
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 ...

Read More
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 53 Reviews
Overall Rating 4.7 out of 5 stars

Customer Photos (12) View All Photos

You Might Also Like

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

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

    giosdad Year: 2006 Model: V6

    Good Answer (0)

Show 1 more answer Question Resolved

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

  • 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 !!!!

    bobnjamie Year: 2012 Model: GT Top 250 Contributor

    Good Answer (0)

Question Resolved

How much horsepower will this exhaust add?

Arthur91 Year: 2013 Model: GT

  • 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.

    Best Answer

    KenobiGT Year: 2008 Model: GT Top 100 Contributor

    Good Answer (4)

Show 1 more answer Question Resolved

More Products You Might Like

Customer Reviews (53) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume 4.891304 4.9
  • Exhaust Note 4.688889 4.7
  • Fit & Finish 4.304348 4.3
  • Bang For Your Buck 4.5 4.5



  • 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

      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

    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: Afternoon

    March 27, 2014

    Bought these and was so excited until

    It took me about 30 minutes to take the stock mufflers off, and once I put the slps on they were about 3 inches off and the tips wouldn't even go on cause the pipes were directed right into the rear valance. I was lucky to of had a shop to be able to bend the hangars to fit and it took about 2 1/2 hours to get them to fit flush. Kind of disappointed for the price you pay and then they didn't even angle up right it took, like in said almost 3 hours to get them perfectly straight and level. But with all that said, it was worth every minute spent on doing this. These really bring the life out of your mustang. The 4" tips look amazing and the sound really is worth any trouble you might have to go through. I highly recommend this product to anyone looking for axlebacks.

    2011mustangGTRyan

    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 New Jersey

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 01, 2014

    2014 slp loud mouth

    All I can say is night and day !! What a difference compared to the stock mufflers slp loud mouth brings out the true mustang my 5.0 sounds amazing and makes the car even more fun to drive !!! Fits nice and looks good also sounds great !!!

    floridaboy18

    Year: 2014 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 5+

    Helpful (1) (0)

Related Categories