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

53 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
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 ...

Read More
Helpful (23)

Read All 53 Reviews
Overall Rating 4.8 out of 5 stars

Customer Photos (12) View All Photos

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11 Questions / 4 Answers

Ask a Question

Are these compatible with the Pypes True Dual Off-Road Exhaust? and whether or not it is or not, what would be the best v6 dual exhaust conversion kit to get both the hugest hp gains and be as loud as possible?

grandpajenkins

Answer This Question I need this answered (2) (1)

Best mufflers What would be the best sounding muffler for mustang gt ?? I want agressive sound , but not to much just driving around. Thanks

Chuck1950

  • i would recommend the loud mouth resonators if you have the stock h pipe. thats what i had and it sounded pretty darn good. if you have an x pipe i recommend the loud mouth 2's which are actual mufflers.

    bankerz

    Good Answer (1) (2)

Show 2 more answers Question Resolved

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)

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Customer Reviews (53) Write a Review

Overall Rating 4.8

out of 5 stars




  • 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

    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)

  • 5/5

    March 31, 2010

    best muffler

    had flow masters but when i put these on they way better. add great sound but you need an x pipe and high flow cats to get the best sound.

    jared

    Helpful (4) (0)

  • 3/5

    March 12, 2010

    not to shabby!

    they sound GREAT at idle... they are growing on me at the top end... but for the money they are pretty good! I went from no mufflers (cats only) to an off road x and these... and yeah i'm pretty satisfied... but wishing i had the money for a bassani cat back... :) someday...

    dave

    Helpful (5) (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    March 13, 2014

    Loudmouth II's > Flowmasters

    I did not buy these resonators here, but I did read the reviews and would have bought them here in different circumstances. When I bought my Mustang it already had a custom exhaust kit with Flowmaster mufflers, but to me the sound was a little tame. Everyone says that the Flowmasters are the end-all, be-all in mufflers so I was hesitant to put these on my GT, but based on what I read here and the video that American Muscle put up showing the comparison between the Loudmouth II's and stock, I went ahead and took the plunge. Let me tell you, the difference is night and day. It has that musclecar sound that raises the hair on the back of your neck. While idling, she has that menacing purr. When I step on it to merge onto the highway, she lets out that angry roar that tells everyone around to get the F out of your way! I still need to add on some good headers, but even if I didn't do anything more to it, I would not be disappointed at all going with the sound it has from here on in. If you are hesitating at all to buy these and put them on your Mustang, you're just wasting time you could be driving around with a mean growling 'Stang.

    madbluestang

    Year: 2004 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Houston, TX, USA

    Helpful (2) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    February 17, 2013

    SLP Loudmouth 2 Mufflers

    I had flowmaster super 44s and they just werent loud enough for me! I got these SLP mufflers and they are AMAZING! You will NOT be disappointed! I turn heads everywhere with these babys! Got em put on with a BBK O/R X pipe. So nasty!! BUY BUY BUY!!

    RobbieR

    Year: 1995 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Seminole, FL, USA

    Helpful (2) (0)

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