Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $15,000!! Enter Now
Coronavirus: We are Open For Business, Prioritizing health and safety Learn More

SLP Loudmouth II Center/Center Bullet Style Mufflers; 2.50-Inch (Universal Fitment)

Item 23027
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $208.95 You Save 4% ($9.00)
Our Price


FREE Shipping

In Stock

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
Choose options to add to cart.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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 -


      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 (1)
      • 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 (1)
      • March 14, 2019

        5 1994 V6 - Starscream37

        Slp ll

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

        Helpful (2)
      • 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 (2)
      • 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 (5)
      • 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)

      Questions & Answers (25 answers)

      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

      Can I use these on a 2019 Mustang Gt since the are welded on? I just need to tone the drone down a bit. The drone my car creates with my H Pipe and MBRP Axleback is a little too much. But I love the loud sound and dont want to lose it. Or would the race resonator's help with cabin noise and not compromise the loud sound?

      • These are a universal fitment, so there is no guarantee for these to perfectly fit for any application. Always expect at least some modification with products advertised with a universal fitment. These will be of the loudest mufflers we have to offer, so if you swap these for your MBRP mufflers it will be louder.

      Helpful (0)

      Are these legal in CA?

      • These have not bee tested for if they pass California exhaust laws. Also, sound levels can vary depending on other modifications.

      Helpful (0)
      10 More Questions
      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 0 answer
      Can these slps 2 bolt directly on a slp 1 catback? Just unbolt the 1s and bolt the 2s up? Its a 98 gt 1 answer
      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

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • None - reuses stock hardware

      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

          Related Mustang Categories