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SLP Loudmouth II Center/Center Bullet Style Mufflers - 2.5 in. - Pair (Universal Fitment)

Item 23027
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Ship to: Ashburn - 20149
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    Features & Details

    • 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
    • Universal Fitment; Modifications Will Be Required
    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.

    Modifications Required. This Muffler was designed to be used on mutliple applications, as it is not a direct fit replacement part. In order to install this Muffler properly on your vehicle, some modifications to the exhaust system will be required.

    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

    MPN# 31064

    CA Residents: WARNING: Cancer and Reproductive Harm -

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

      Customer Photos (22) Submit Your Photo

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        Questions & Answers (23)

        5 Top Rated Questions

        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?

        • The SLP Loudmouth II Mufflers are 2.5" in diameter, and the Pypes True Dual Exhaust is also 2.5" in diameter, so it would fit together, depending on the location. If you were looking to replace these mufflers with the mufflers on the true dual exhaust, this would not work, due to the true dual exhaust mufflers having an offset inlet and outlet on the muffler itself. The true dual exhaust with the smallest mufflers and without catalytic converters will create the largest gains.

        Helpful (2)

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

        • The SLP Loudmouth II Mufflers - Pair (79-04 All) are going to have a straight-through design for increased power that will make a rich, throaty exhaust tone. They offer minimal restriction which will give your car an increase in power. The SLP Loudmouth Resonators - Pair (79-04 All), item # 23032, ( have a very loud, aggressive tone. These Resonator's are designed to have virtually no restrictions. This will free up more power and help produce the most aggressive sound. The main difference between the two is the amount of restriction, which will give your car different sounds. The Resonator's are going to be extremely loud while the Muffler's will be loud with a throaty tone.

        Helpful (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

        • 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.

        Helpful (1) Show 2 more answers

        I have a stock 2007 mustang convertible v6 4.0L single exhaust .Can I put the SLP Loudmouth 2 or a Flowmaster super 10 on my car as a axle-back set up or are those to much for my v6 4.0L? How's the drone, would it be to much? Thank

        Can these slps 2 bolt directly on a slp 1 catback? Just unbolt the 1s and bolt the 2s up? Its a 98 gt

        • These have a universal fitment, so we cannot inaugurate bolt-up fitment on any application. Please expect a possibility of modifications being required due to this.

        Helpful (0)
        10 More Questions
        What is the difference between these and the 1's.I mean by muffler and resonator ,is one quieter than the other.Thank You. 1 answer
        What is the best option flow masters or slp loudmouth? 1 answer
        Do you think this would sound good on a new edge v6 mustang stock single exhaust not dual? 1 answer
        My current setup on my 96 gt is stock headers, bassani o/r xpipe to the slp loudmouth 1 catback. Super loud and waaaay too raspy for my liking. Sounds "trumpety" if tht makes sense. My question is, will these LM 2 mufflers help make the tone less raspy? Or wut mufflers can you suggest to help facilitate a more muscle car (deeper tone) sound? Thanks 1 answer
        Can this be welded/installed on a 2.25 diameter piping? 1 answer
        I got a 91 gt..wich slp loudmouth would you guys consider?...i want my stang to make noise either on idle or on the road..thanks 1 answer
        I have. 2012 v6 all stock, just muffler deletes, will the SLP II give me an aggressive tone, would it be worth it? 1 answer
        I have a 2003 Mach 1 everything is stock at this time. I would like the car to have a deep throaty sound. Something that Sounds good at idle and smooth at cruising speed but sounds mean when I get on the gas. All I will be changing at this time would be the muffler. Will the loudmouth 2 give me what I'm looking for? 1 answer
        SLP Loudmouth II or Pypes M80? Which one is louder? I'm only replacing the mufflers. Everything else will be stock. Thank you! 1 answer
        I have a friend with a 04 mustang gt and she wants the loudmouth || but her stock ones are welded on how can we put these on... 1 answer

          Customer Reviews (88) Write a Review

          Ratings Summary

          4.7 out of 5 overall rating from 88 customers

          Installation Time: Full Day

          Installation Cost: 0-$100

          • September 19, 2019

            5 2014 GT - TastetheRambo57 Installation Time: Shop Install Installation Cost: 0-$100


            Incredible Performance and sound on my 2002 Ford Mustang. If your looking for a rumble she definitely has it for you

            Helpful (0)
          • June 23, 2019

            5 2004 Cobra - DangerRuss Installation Time: Afternoon

            Big sound difference

            Very happy with this product.. added them to my new American Racing long tube headers on my Terminator Cobra and they sounds amazing... very loud growl and nice deep rumble that sounds like you are dragging some two by fours around behind your car

            Helpful (0)
          • April 14, 2019

            5 2002 GT - Smokey


            Works and sounds great!. Even looks great under the car and figment was amazing and was easy to do

            Helpful (0)
          • March 14, 2019

            5 1994 V6 - Starscream37

            Slp ll

            This things made my v6 to a v8 it sounds Awesome!!

            Helpful (0)
          • February 20, 2019

            4 2014 V6 - OmarA Installation Time: Less than 1 Hour

            SLP Loudmouth

            Very good and tge sound of the car os extremely different

            Helpful (0)
          • January 19, 2019

            5 2003 Mach 1 - Andrew Installation Time: Less than 1 Hour

            Great sounds

            Had slp lm1s on the car from previous owner. Put a Bassani catted x on and the car sounded like a trumpet. Switched out the lm1s with lm2s and now I love the way the car sounds. Pretty quiet until you really get on it. Sounds good really happy with it.

            Helpful (1)
          • January 17, 2019

            5 2003 Cobra - Tracy Installation Time: Less than 1 Hour

            SLP Loudmouth 2’s

            I was running the Pypes mufflers like these, only had them on for about two years and the inside of the broke and was rattling at low rpm. So i brought the loudmouth 2’s, very good quality welds on the outside of the mufflers. The sounds is about the same as the Pypes mufflers, Hopefully the make it more than two years.

            Helpful (2)
          • September 05, 2018

            5 2003 GT - BaileyC Installation Time: Less than 1 Hour

            They are fantastic

            this muffler pairs perfect with a BBK off road x pipe

            Helpful (4)
          • August 05, 2018

            5 2002 V6 - Deegee Installation Time: Shop Install Installation Cost: 0-$100


            Love how my car sounds! I now drive with a smile on my face it just sounds amazing!!

            Helpful (3)
          • July 27, 2018

            5 2004 V6 - DerrickW Installation Time: Shop Install Installation Cost: 0-$100

            Slp lm2

            These mufflers are great! Love the way they sound!!!

            Helpful (3)
          • June 17, 2018

            4 1979 Cobra - calebh Installation Time: Afternoon

            solid muffler

            sounds good, looks ok, just not happy it came in with scuffs and scratches i couldn't polish out, but other than that great

            Helpful (3)
          • April 19, 2018

            5 1988 GT - 88fox Installation Time: Shop Install Installation Cost: $100-$250

            Slp ll

            These slp mufflers do not disappoint!!! Throwing them on with an x-pipe and your stang will sound vicious!!!!

            Helpful (5)
          • March 09, 2018

            4 2004 Cobra - QuintariusG Installation Time: Less than 1 Hour


            If you want loud it’s great sound get what you asked for lol I have a 04 cobra with kooks long tubes and pypes off road x no cats only change pypes mufflers and added slp mufflers more rumble and turns heads

            Helpful (4)
          • February 19, 2018

            5 2002 GT - Gabriel

            Best sounding SLP

            I have the SLP loudmouth II Cat Back system on my 02 mustang and completely love it! Went with an H pipe instead of X. It has the perfect tone to it, not obnoxiously loud all through rpms. Great rumble at idle but when you get to your higher rpms this system really comes alive and sounds amazing! It's guaranteed to turn heads and you will have a lot of people tell you your car sounds great!

            Helpful (3)
          • February 05, 2018

            5 2003 GT - Andrew03 Installation Time: Less than 1 Hour

            Awesome Pair of Mufflers!

            I have ran Loudmouth 1's for over a year and they are just LOUD all the time. I decided to swap them out for the Loudmouth 2's and I could not be happier. No where near as raspy but still give off a great sound and volume.

            Helpful (3)
          • December 30, 2017

            5 2000 GT - BrandonR Installation Time: Less than 1 Hour

            Slp loudmouth

            great sound I had the Restorator's first then I bought the loudmouth 1 and I love them pretty sure the neighbors love them also

            Helpful (4)
          • December 19, 2017

            5 1996 Cobra - 97laserredgt Installation Time: Less than 1 Hour

            Slp loudmouth IIs

            Love the sound and throttle response is way better with these mufflers. Fast shipping thank you american muscle team.

            Helpful (4)
          • November 23, 2017

            4 1992 LX - Michael Installation Time: Shop Install Installation Cost: $100-$250


            Like the aggressive sound that it gives the car very happy with my purchase and fast shipping will be ordering more parts for both my mustangs

            Helpful (3)
          • October 06, 2017

            5 2003 Cobra - Brian Installation Time: Shop Install

            Cali sucks

            Gave my cobra better sound that is for sure and really recommend them but going thru 4 cats sucks

            Helpful (5)
          • September 25, 2017

            5 1991 GT - SamuelBall Installation Time: Less than 1 Hour

            SLP Loudmouth

            Has a beautiful race growl sound. Not raspy at all which is what I like. With turn downs and just these mufflers and a cam you break necks easily.

            Helpful (4)

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