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SLP Loudmouth II Mufflers - Pair (79-04 All)

56 Reviews
Our Price

$191.95

  • Item #23027
  • MPN# 31064

  • Market Price $199.95
  • You Save 4% ($8.00)
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Customer Photos
Features
  • Rich, Throaty Exhaust Tone
  • Straight-Through Design for Superior Flow
  • Designed for SLP Modular Cat-Backs
  • 2.5" Inlet/Outlet Diameter
  • 304 Polished Stainless Steel Construction
  • Sold as a Set of Two
Description
More Power and Sound. SLP's famous Loudmouth II "Bullet Style" race mufflers offer minimal restriction, increased horsepower and an aggressive throaty tone, that is only second to the Loudmouth "shotgun" race resonators for sound.

SLP Modular Design. SLP manufactures their Mustang catback exhaust systems with a unique modular design that allows you to easily and quickly swap out the included mufflers with any of the other SLP mufflers or resonators they make to suit your driving needs.

Superior SLP Construction. The SLP Loud Mouth II "bullet" mufflers are constructed from high hand-polished 304 stainless steel with an embossed SLP logo for great looks, and feature a ceramic-wrapped, perforated core that reduces high-frequency noise and in-car resonance for a rich, throaty exhaust note.

Application. These SLP Loudmouth II Mufflers are designed to easily replace the existing mufflers or resonators in any of SLP's 1979 to 2004 Mustang Cat-Back exhaust systems. The may also be used in the fabrication of custom exhaust systems.

Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

What's in the Box
Hardware included:
  • None - reuses stock hardware
Installation Info
Tech Specs
Measurements:
  • 2.5" ID/OD
  • 4.5" body diameter
  • 18-3/16" overall length
Will it fit my Mustang?
  • Bullitt - 01
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

Most Helpful Reviews

5/5
Prepare to get noticed!

I bought my 2001 Mustang GT a few months ago with these mufflers already installed by the previous owner. These Loudmouth II's have a very aggressive growl and turn heads every where I go. They have a ...

Read More
Helpful (2)

5/5
94 Yellow Mustang GT.

Just the sound I have been looking for. Great buy for the money.

Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 56 Reviews

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11 Questions / 3 Answers

Ask a Question

Roush Side Exhaust? I have a 2001 Stage 2 Roush with side exhaust...will these work with the exhaust system i have?

SkiDog

  • Yes it will! Just not as much room to work with.

    BRayd

    Good Answer (0) (0)

Answer This Question I need this answered (0) (0)

Cross-Compatible? I have a MagnaFlow cat back and was wondering if I could easily swap out those regular mufflers with these straight pipe mufflers without any problems? Thanks.

WSHCapitals90

Answer This Question I need this answered (0) (0)

loud mouth 1 VS loud mouth 2 99 gt. i have the LM1 system with cat delete, o/r x-pipe, stock manifolds and its a bit to loud/ raspy for me at times. would the LM2 be slightly less but still more than say a flow master (little to quiet)? so I don't have to buy whole new system, just $200 for the mufflers would be worth it. thanks

jeremyr

  • Absolutely, I just made the switch myself for the same reason. You won't regret it. The loudmouth 2's quiet down normal driving an idle but they aren't quiet by any means. All the raspy-ness is gone but under WOT still roar like LM1"s. Under normal driving sounds more like a performance muffler rather then a sloppy straight pipe

    Jsunzx7

    Good Answer (2) (0)

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Customer Reviews (56) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Full Day

Installation Cost:0-$100

  • Loudness / Volume 4.2 4.2
  • Exhaust Note 4.566667 4.6
  • Fit & Finish 4.8 4.8
  • Bang For Your Buck 4.366667 4.4



  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    April 21, 2016

    94 Yellow Mustang GT.

    Just the sound I have been looking for. Great buy for the money.

    Jaybird

    Year: 1994 Model: GT Driving Style: Show 'Stangs I have owned: 5+

    Helpful (1) (0)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    December 01, 2013

    Good mufflers

    I put these on my 86 5.0 along with the x pipes and stage 3 cam amazing tone, not to loud but not quite either... Turn many heads when I drive by good product.

    Alan1986

    Year: 1986 Model: GT Driving Style: Race 'Stangs I have owned: 2

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    May 02, 2013

    Prepare to get noticed!

    I bought my 2001 Mustang GT a few months ago with these mufflers already installed by the previous owner. These Loudmouth II's have a very aggressive growl and turn heads every where I go. They have a much nastier sound than your typical Flow Masters. They're actually pretty quiet when the car is idol, but as soon as you give it some gas, these mufflers roar and crackle with an amazing tone. If you are tired of your quiet stock exhaust, I highly recommend these mufflers. They will definitely make you stand out with a very unique sound that will thrill you and everyone else around.

    Stebo

    Year: 2001 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Virginia, USA

    Helpful (2) (0)

  • 5/5

    March 30, 2011

    amazing sound!

    Had these put on my 04 gt yesterday and all i can say is WOW! have a offroad X with these and the sound is just incredable.

    Jordan

    Year: 2004 Model: GT

    Helpful (1) (0)

  • 4/5

    November 05, 2008

    03 GT

    These mufflers sound great with the stock mid pipe! But, I put an O/R H on there and its just too loud. I am going back to a chambered muffler! Great quality, though I do recommend getting the catback.

    Trey B

    Year: 2003 Model: GT

    Helpful (1) (0)

  • 5/5

    June 22, 2010

    WAY better than flowmasters

    I put these on my 02 earlier today and i drove around for maybe 30 minutes and i got at least 3 times more looks than i did with my flowmasters. Thank you American Muscle for the fast shipping. Highly recommended for any true mustang lover

    Dennis B

    Year: 2002

    Helpful (23) (3)

  • 5/5

    April 23, 2010

    awesome

    put these on my 02 gt and they sound great. then i went a step further and put an O/R X-pipe on it and OMG this thing is loud!!! overall a great sounding muffler. thanks AM

    brandon

    Year: 2002 Model: GT

    Helpful (12) (0)

  • 5/5

    June 19, 2010

    5 star product !!!!!

    Great sound, Very pleased, Just the right tone!

    2002 GT

    Helpful (14) (2)

  • 5/5

    December 30, 2010

    A Good Value

    I bought these as a replacement for a bassani muffler that was taken out by a protruding manhole cover. I had some worries about them being a bit loud for my tastes (LT headers, X-pipe o cats), but that proved to be unfounded. They were not too loud and sound good once I have the car tached up, they sound a bit gruff compared to the bassani at low rpms but not objectionably so.

    YRUNVS

    Helpful (6) (0)

  • 5/5

    July 22, 2010

    Great sound...

    At first I purchased the Loudmouth Resonators - after reading some comments, they were returned (very easy with AM) and picked up these...amazing DEEP sound - welded to stock 2.25 pipes ($80)....great way to go if you don't want to spend $400+ for full CAT system...[FYI: if you don't plan on putting on headers and upgraded x/h pipe....buying the full Catback is a waste of $$$ -]

    Aaron

    Year: 1980

    Helpful (13) (4)

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