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

47 Reviews
Our Price

$191.95

  • Item #23027
  • MPN# 31064

  • Market Price $212.99
  • You Save 10% ($21.04)
In Stock Ships same business day.
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Customer Photos
Features
  • Rich, throaty exhaust tone
  • Straight-through design for superior flow
  • Designed for SLP Modular Catbacks
  • 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 Catback exhaust systems. The may also be used in the fabrication of custom exhaust systems.

Mustang 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 Read All Reviews

Overall Rating 4.7/5 Write a Review
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) (3)

5/5
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

Helpful (12) (0)

Customer Photos (12) View All Customer Photos

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Q & A (6 Questions, 2 Answers) Ask a Question

What's the difference between the mufflers and the resonators?

Theunit Year: 2002 Model: GT

Be the First to Answer This Question
Good Question (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 Year: 1999 Model: GT

Good Question (0) (0)
  • 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

    Helpful (1) (0)

    Jsunzx7 Year: 2000 Model: GT

Show 1 more answer Answer This Question

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

SkiDog Year: 2001 Model: Other

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Good Question (0) (0)

Reviews (47) Write a Review

  • 5 Stars .79 79%
  • 4 Stars .17 17%
  • 3 Stars .04 4%
  • 2 Stars 0 0%
  • 1 Stars 0 0%
4.7

out of 5 stars

45 Customers Recommend this Product

Installation Time:Full Day

Installation Cost:0-$100

  • Loudness / Volume: 4.086957 4.1/5
  • Exhaust Note: 4.521739 4.5/5
  • Fit & Finish: 4.73913 4.7/5
  • Bang For Your Buck: 4.26087 4.3/5
Filter By Sort By
  • 5/5 Yes, I recommend this product

    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 Yes, I recommend this product

    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 Yes, I recommend this product

    June 19, 2010

    5 star product !!!!!

    Great sound, Very pleased, Just the right tone!

    2002 GT

    Helpful (14) (2)

  • 5/5 Yes, I recommend this product

    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 Yes, I recommend this product

    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 Yes, I recommend this product

    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 No, I do not recommend this product

    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 Yes, I recommend this product

    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 Yes, I recommend this product

    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)

  • 5/5 Yes, I recommend this product

    July 04, 2012

    SLP LOUDMOUTH 2 NOT LOUD EVEN WITH O/R MID PIPE

    Well first off i had the slp loudmouth 1 catback with a o/r pro chamber and it was loud i mean loud even at half throttle. It screamed and to me just made me nervous to even pull out of places and this is coming from a 20 year old. So with that said is why i switched to these slp loudmouth 2 thinking it would still be loud but with alot more deeper sound and a nice rumble at cruise, and let me tell you that they are alot more quieter then the 1's. Very quieter it has a nice throaty sound to it but it still isnt what im looking for. If u want something with a LOW rumble at idle and quiet during cruising and scream at WOT then this would be for you. Time so start looking for the right catback all over again.

    tom1992

    Year: 2000 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1

    Helpful (2) (0)

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