SLP Mustang Loudmouth Axle-Back Exhaust M31014 (05-10 GT, GT500)

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

100+ Reviews 15 Answers

Market Price $376.95 You Save 4% ($15.00)

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$361.95

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Item 23013
MPN# M31014

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

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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

Product Resources

Customer Photos (76) Customer Reviews (100+) Questions (36) & Answers (15)

Review & Installation 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

CA Residents: Warning: California's Proposition 65

What's in the Box

Hardware included:

(4) Four Clamps

Installation Info

Installation Time: (approx) 1 Hour

Difficulty Level:Light to Moderate mechanical skill required.

Installation Guides:

Manufacturer:
How to install a SLP Loudmouth Axle-Back Exhaust on your 2005-2010 GT Mustang

Customer Submitted:
SLP Loudmouth Axle-Back Exhaust (05-10 GT & 07-10 GT500) - Installation Instructions

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

Tech Guides:

Will it fit my Mustang?

Bullitt - 08, 09
GT - 05, 06, 07, 08, 09, 10
GT500 - 07, 08, 09, 10

Questions & Answers (36)

5 Top Rated Questions

I have a 2007 Saleen H281 heritage V8 mustang. Will this fit?

Thre SLP Loudmouth Axle-Back Exhaust will pair with the 2007 Saleen H281 Mustang GT.

Helpful (1)

If I have a dual exhaust 07 v6 will this still ?

Yes, if you have dual exhaust conversion kit on your Mustang this axle back exhaust will fit.

Helpful (1)

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?

Yes, to install this exhaust, you will need to remove the factory mufflers to install this in its place.

Helpful (1)

Which exhaust are louder these or the pype bombs or the Flowmaster outlaws

The Flowmaster Outlaws will be the loudest exhaust out of the three.

Helpful (0)

Comparing these by SLP to the Pypes Bombs, which exhaust is louder?

That's definitely a tough choice. Both exhausts are definitely loud, but on a scale of 1 to 10. I would rate the Pypes at a 8/10 and the SLP a 7/10. In my opinion, the Pypes is slightly louder than the SLP.

Helpful (0)

Not finding an answer? Ask your question! Post Your Question

10 More Questions

Does this drone like a muffler delete, because a while ago I got a muffler delete, while it sounds good, it gives me and my occasional rear passengers a headache. 1 answer

The SLP Loudmouth Axle-Back Exhaust is a Muffler Delete axle Back, and will not have any mufflers included.

Helpful (0)

Will these fit a 2006 lincon ls?, I can't find slps that are for that car but there's YouTube videos of cars that have them. Just can't find where to get em 1 answer

The SLP Loudmouth axle-back exhaust is designed to fit 05-10 Mustang GT and 07-10 GT500 models. Unfortunately the exhaust will not fit a '06 Lincoln LS.

Helpful (0)

Will these fit on a 07 v6 that has the dual exhaust conversion on it? 1 answer

Fitment of the SLP Loudmouth Axle-Back Exhaust on dual exhaust conversion cars will vary based on the design of your dual exhaust conversion.

Helpful (0)

Hello, Ihave the SLP Loudmouth axel-back exaust(Love them!). But what else do I need to add to go even louder meaner? 1 answer

If you are looking to make a little extra sound and get more tone from you exhaust, I will recommend investing in a new mid-pipe (X-pipe or H-pipe) which allows the lower portion of the exhaust to breathe easier. This will add an aggressive tone with a bit of volume since there is less restriction. I will also recommend considering an aftermarket header which will also allow for less restriction from the exhaust system while even adding performance gains. Please be advised that these exhaust modifications can create issues with your state emissions which can deem a failed inspection. Please consult your local/state regulations to confirm if these upgrades are applicable for your vehicle.

Helpful (0)

Will these pass California emission and smog test? 1 answer

The SLP Loudmouth Axle-Back Exhaust does not have a CARB EO number. We suggest checking with your local authorities to see if this would be legal in your state.

Helpful (0)

Are these pretty loud without off rd x pipes and long tube headers? And will they pass emissions in Atlanta ga ? 1 answer

The SLP Loudmouth Axle-Back Exhaust will be fairly loud, as they are replacing your mufflers with small resonators. These will not have any effect on vehicle emissions testing.

Helpful (0)

Is the exhaust noise legal for Pennsylvania state inspection as in not a true muffler? 1 answer

PA State Inspection requires at least one muffling device to pass - since the SLP Loudmouth Axle-Back Exhaust eliminate the muffler, these would technically not pass.

Helpful (0)

how badly will this effect my gas mileage?? 1 answer

Axlebacks such as this SLP Loudmouth Axle-Back Exhaust will not cause a change in fuel economy as it will only change sound.

Helpful (0)

What’s the difference between these SLP’s and Flowmaster outlaws? Would back pressure be an issue with no catalytic converters? 1 answer

The SLP Loudmouth Axle-Back Exhaust and Flowmaster Outlaw Series Axle-Back Exhaust item number 18423 are made by separate companies and follow different design philosophies. The SLP Loudmouth will be a muffler delete axleback, having just piping and a tip. This will be very free flowing, but will produce no back pressure. The Flowmaster Outlaws will utilize a resonator or glass pack style muffler, which will still allow for large amounts of flow, but will create a small amount of back pressure. Both will allow for low back pressure when used without cats, and will be very loud. This should not create any major issues with the Flowmasters, however the SLP's may make cause back pressure to drop too low.

Helpful (0)

Will these axlebacks provide back pressure? 1 answer

The SLP Loudmouth Axle-Back Exhaust uses resonators within the tips, so this will provide some back pressure, though it will be drastically less than what is created by the stock mufflers. Your catalytic converters will also cause back pressure in the exhaust, so this should not be a concern, especially on systems still using cats.

Helpful (0)

People Who Bought This Item Also Bought

Customer Reviews (100+) Write a Review

Overall Rating

4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

Loudness / Volume 4.74537 4.7
Exhaust Note 4.791667 4.8
Fit & Finish 4.62963 4.6
Bang For Your Buck 4.62963 4.6

no one in the world ever gets what they want, and that is beautiful

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4/5

Installation Time: Afternoon

November 03, 2018

Slp loudmouths axle backs

Love the way they sound! Definitely the best choice if you want loud for a good price, Only thing is that I have and 09 bullitt and the hangers didn't line up right at all. But I made it work and still looks and sounds amazing

NcGt

Year: 2009 Submodel: Bullitt

Helpful (0) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 3
  3
- Bang for your Buck 4
  4
4/5

Installation Time: Afternoon

October 22, 2018

The real review for loud exhaust fans

Yes they are loud, mostly from the outside though. I love loud exhaust and I definitely want more than this can give but you need to do more than an axle back to get there. They do have a great sound to them though and no drone what so ever like I got from my Borla Stingers. I do have to say the fit and finish kind of sucked. The flange that goes over the over axle pipe on the passenger side didn’t have relief cuts in them so it wouldn’t clamp down on it but that got fixed with an angle grinder. Also the driver side brackets weren’t quite proper so I had to wrestle with it to get it bolted. All in all though a good kit as long as you can swing a wrench.

Mike

Year: 2008 Submodel: GT

Helpful (1) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 5
  5
- Fit & Finish 2
  2
- Bang for your Buck 5
  5
5/5

Installation Time: Shop Install

Installation Cost: 0-$100

October 16, 2018

Good and loud

Have 2008 G.T. Wife liked car and after putting slp loud mouth on it she love it . Nice and loud yes it is V8 . 5speed. Little high on price but still sounds good. We’ll be buying more from A.M. by the way we are not young kids in 50s and 60s .

GaryH

Year: 2008 Submodel: GT

Helpful (1) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

October 09, 2018

Live them

Sounds great, easy install, makes the peeps turn their heads and see what's coming!

AaronS

Year: 2006 Submodel: GT

Helpful (1) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

September 22, 2018

Mustang power

Love the sound and love American Muscle! You own a mustang? If you do this is the place to get what you need. The only thing I had a issue with was the brackets were a little off but easy to make it work. The sound is awesome! Want people to turn their heads when u come by.... then this is it!!

Bray13

Year: 2008 Submodel: GT

Helpful (2) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 4
  4
- Bang for your Buck 5
  5
5/5

Installation Time: Full Day

September 21, 2018

Loud!

I recommend these for those who wish to wake up every person on the road these can get so loud it’s stupid but crazy fun! I’ve got the bbl shorties, o/r x pipe from pypes, and these alp loudmouths this combo is so loud and raspy I love it brings a smile to my face every time I start her up! Install is full day as I did full exhaust all at once

AustinC

Year: 2008 Submodel: GT

Helpful (3) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 4
  4
4/5

Installation Time: Less than 1 Hour

September 20, 2018

Idle

Overall pretty happy. The only thing i think could use improvement is how surprisingly quiet it still is when idling at a light ect.

JonathanO

Year: 2007 Submodel: GT

Helpful (0) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 4
  4
- Fit & Finish 4
  4
- Bang for your Buck 4
  4
5/5

Installation Time: Afternoon

September 18, 2018

Good looking exhaust

Since I put these on a V6 I had to do a little bending on the hangers so they would fit right. I used a ford racing exhaust conversion some years ago. These axle backs replaced a set of Pypes Pipebomb axle backs. These sound great. Not as loud as I expected but a 4.0 will never be as loud as a V8. Overall a great product.

curtis

Year: 2008 Submodel: V6

Helpful (1) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 5
  5
- Fit & Finish 4
  4
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

September 15, 2018

Badass!!

I still have the factory cats and headers but the previous owner had put on SLP Powerflos.. I'm not sure why since those are designed more for the V6's.. They sounded good and had a nice deepness to them but they still didn't quite have that "American muscle car" growl I have been looking for. I ordered these Loudmouths and got them in about 3 days.. Install took about an hour and a half only because when I put it all together again the passenger pipe just wasn't facing straight out as is should.. I had to play with it a little bit to get it to line up but it finally did.. All in all, I am very happy with these pipes.. They give you a loud "in your face" kind of scream but aren't too loud until you start playing around with the cats and mid pipes.. I can't wait to see what this setup will sound like with a Pypes Off-Road H-Pipe!! You can see the before and after on the You Tuberlars by looking up "05 Mustang Gt SLP Upgrade Before and After"..

Darkwardrums

Year: 2005 Submodel: GT

Helpful (3) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

August 25, 2018

SLP loudmouth

I had high hopes for this exhaust and all my expectations were met. The exhaust sounds amazing and it pops and has a mean growl to it. Only problem was I got the wrong extension pipe on the right side, it didn't have cut outs for the exhaust clamps, but it was no biggy cause the mechanic used a saw to cut them out for free.

Zetaprime0

Year: 2009 Submodel: GT

Helpful (3) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

August 11, 2018

Great Sound!!

Sounds amazing! You will not be disappointed. Easy to install.

BrettM

Year: 2007 Submodel: GT500

Helpful (2) Thanks for your input!
- Loudness (Volume) 4
  4
- Exhaust Note 5
  5
- Fit & Finish 3
  3
- Bang for your Buck 5
  5
5/5
July 26, 2018

Sweet Sound

100 worth the funds got it put on for 50 bucks. Baby jawn started roaring

Tydawg

Year: 2006 Submodel: GT

Helpful (4) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

July 24, 2018

07 GT

Put these on with SLP long tube headers, minus cats and mufflers, and your neighbors along with everyone within a 1/2 mile radius will immediately hate you. The loudest exhaust outside a track I have heard.

TimK

Year: 2007 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 4
  4
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

July 03, 2018

Good song

I love kit SLP exhaust very good song loudness is it music. Hihihi

Rene

Year: 2006 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 5
  5
4/5

Installation Time: Afternoon

June 25, 2018

Simple Swap

easy install, Driver side didnt quite hang right, going to rebend pipe to match passenger side

ThadW

Year: 2008 Submodel: GT500

Helpful (2) Thanks for your input!
- Loudness (Volume) 3
  3
- Exhaust Note 4
  4
- Fit & Finish 2
  2
- Bang for your Buck 4
  4
2/5

Installation Time: Shop Install

June 25, 2018

I can’t Believe it!!

It honestly breaks my heart writing this.... I bought this set-up about two weeks ago after all the YouTube videos I saw, I thought they would be everything I hope they would?! After being ripped off on the install (my fault I was just so eager to get them on) I was so disappointed!!! After having straight pipes, and hating it!!! Still was decently loud... but was thinking through all and all this was it? Sadly they aren’t as loud as I dreamt they would be!! It may not be the same experience for everybody, but even at cold starts it’s so quiet! Just giving my piece of mind, hopefully someone other than myself has experienced what I have?

JavierC

Year: 2006 Submodel: GT

Helpful (3) Thanks for your input!
- Loudness (Volume) 1
  1
- Exhaust Note 1
  1
- Fit & Finish 1
  1
- Bang for your Buck 1
  1
5/5
June 21, 2018

Outstanding

Make the stang sound and feel like a classic muscle car...

Hndover

Year: 2008 Submodel: GT

Helpful (5) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 4
  4
- Bang for your Buck 5
  5
5/5

Installation Time: Less than 1 Hour

June 07, 2018

NICE AF

It sounds really good the fitment wasn’t bad. Very good for the price. Can’t complain!

RhashaadL

Year: 2005 Submodel: GT

Helpful (3) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 4
  4
5/5

Installation Time: Less than 1 Hour

May 28, 2018

The sound of freedom

Sounds very loud and proud. If you’re an American with a v8 mustang this is the exhaust for you. If I had to explain the sound, it’s like hearing the sound of 100 bald eagles soaring across the Statue of Liberty. Paired with headers, an off road H pipe, they sound amazing.

NicholasF

Year: 2007 Submodel: GT

Helpful (6) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 4
  4
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

May 24, 2018

Awesome!

Fast shipping. Excellent quality. Exactly as described.

DakotaG

Year: 2008 Submodel: GT

Helpful (2) Thanks for your input!
- Loudness (Volume) 5
  5
- Exhaust Note 5
  5
- Fit & Finish 5
  5
- Bang for your Buck 4
  4

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

Buy Together

$361.95

+$49.99