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SLP Loudmouth Center/Center Shotgun Style Resonators; 2.50-Inch (Universal Fitment)

Item 23032
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      Review & Installation Video

      The SLP Loudmouth Shotgun Style Resonators would be a great choice for any Mustang owner really who is looking to create their own custom exhaust setup, or more specifically, for the '79 to 2004 cars using an existing SLP Exhaust System and and want to replace a damaged resonator or muffler as these will be a direct fit. Now, SLP does include two hand-polished 304-grade stainless resonators for right around 160 bucks and the install will vary depending on your setup. So, let's just go middle of the road, two out of three wrenches on the difficulty meter and a couple of hours from start to finish to be on the safe side. So, right off the bat, I would say the most popular application for the SLP resonators here will be as an affordable solution to give your Fox or SN95 a little bit more rumble by cutting out those factory mufflers and welding these guys into place. That's very evident in the customer review and photo section as well as on YouTube where any search of the SLP resonators will immediately turn up dozens of New Edge GTs sounding off with this particular setup. And I have to admit, guys, I think it sounds pretty awesome, very deep, very aggressive, even with those factory manifolds and cats in place and gets just downright dirty with a set of long tubes or an aftermarket mid-pipe.But on the other hand, if you already have an existing SLP cat-back on your V8-powered Fox or SN, whether it be the Loudmouth or the Loudmouth II, these will be a direct replacement for the existing resonators if you ever need to swap them out for whatever reason, maybe you hit something on the road, scraped them up, whatever the case, this will be an easy and direct swap.Dimensions for the resonators themselves will be just over 18 inches in total length with a 4-inch body diameter and that will allow them to be used in some pretty tight spots underneath the car. Inlet and outlet will be both 2.5-inches and they will be straight through by design, eliminating a big chunk of restriction otherwise caused by a traditional chambered muffler. Finally, guys, these things are made from premium 304-grade stainless steel and will be sold in sets of two. As far as your installation is concerned, well, again, guys, it will go down in one of two different ways. Now, if you're replacing an existing resonator or muffler on an SLP cat-back, it's gonna to be a piece of cake, right? Just simply loosen up the clamps, swap them out, and you're good to go.On the other hand, if you do plan on incorporating these in place of a set of factory mufflers, then there will be some cutting, there will be some welding involved, which will stretch the time and the difficulty of the job. Because of the differences in install here, guys, the site's just gonna go middle of the road two out of three wrenches on the difficulty meter and a couple of hours from start to finish. But if you're looking to go custom and create your own system, or just replace a set of mufflers or resonators on an SLP cat-back, the Shotgun style resonators here will be an affordable solution and you can grab your pair right here at

      Product Information

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


      • Loud Aggressive Sound
      • Virtually No Restrictions for More Horsepower
      • Designed for SLP Modular Cat-Backs
      • 2.5" Inlet/Outlet Diameter
      • Hand-Polished 304 Stainless Steel
      • Sold as a Set of Two
      • Universal Fitment; Modifications Will Be Required


      More Power and Sound.   These SLP Loudmouth "shotgun" race resonators are designed to have virtually no exhaust flow restrictions to free up more power and to produce the most aggressive sound possible.

      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.

      High Quality Construction.   The Loudmouth "shotgun" resonators are constructed from hand-polished 304 stainless steel and are embossed with the classic SLP logo. They have a high flow design and measure in at 2.5" ID/OD, 4.5" Body Diameter, and a 18-3/16" Overall Length.

      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 Resonators are designed to easily replace the existing mufflers or resonators in any of SLP's 1979 to 2004 Mustang Cat-Back exhaust systems. They 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

      MPN# 31062

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 100+ customers

      Installation Time: Full Day

      Installation Cost: $100-$250

      • March 29, 2020

        5 2003 GT - agresive Installation Time: Shop Install Installation Cost: $100-$250

        it sounds loud!!

        if you want your car to sound loud this is the item for you

        Helpful (0)
      • December 22, 2019

        5 2003 Mach 1 - BayAreaMach1 Installation Time: Shop Install Installation Cost: 0-$100

        The best

        Woke up my Mach 1 sounds amazing! Took it to my local muffler shop to have them installed.

        Helpful (0)
      • December 17, 2019

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


        These things sound so good! They need to be welded on. I could not get them so I took them to a shop instead

        Helpful (1)
      • December 13, 2019

        5 2003 V6 - Anonymous Installation Time: Less than 1 Hour

        there great

        I have a v6 dual exhaust but this sounds great it has the pop and sound I wanted

        Helpful (0)
      • November 09, 2019

        5 2000 GT - RobertF Installation Time: Shop Install Installation Cost: $100-$250

        Those pops!

        Went from off-road h pipe with flowmasters super 10’s to these and man what a difference. The car woke up, sounds mean and pops like crazy rev matching. Definitely recommend For your 2v

        Helpful (2)
      • October 10, 2019

        5 1993 GT - 3brandon10 Installation Time: Shop Install Installation Cost: $100-$250

        Perfect mufflers

        As soon as these slp resonators were installed in replace of my stock mufflers, you could tell the difference.

        Helpful (0)
      • September 26, 2019

        4 2002 GT - SLPloudmouth Installation Time: Afternoon

        SLP loudmouth reanators

        My neighbors can hear my car growling down the street with these. Best for high school students and college students on a budget. loud enough but not obnoxious.

        Helpful (0)
      • September 13, 2019

        5 1992 LX - Justin92lxblack Installation Time: Less than 1 Hour

        Loud yo!

        Screams rite out of the X pipe!!! Had to get some tail pipes to reduce volume, has a wicked Rap at 1900rpm! And screams at 5!

        Helpful (2)
      • August 28, 2019

        5 2000 V6 - Gilberto Installation Time: Less than 1 Hour


        Have these with a h pipe and the rest stock people always say its a stock v8 and i switched my flow masters 40 for this loudmouth amazing

        Helpful (1)
      • July 30, 2019

        5 2004 GT - AlexanderO Installation Time: Shop Install Installation Cost: $100-$250

        I love the sound note

        They sound great I love the sound I would recommend this vehicle to anyone

        Helpful (1)

      Questions & Answers (85 answers)

      5 Top Rated Questions

      Bone stock exhaust I have a bone stock exhaust. I do not have the money to buy a whole catback exhaust and have it installed. So I was wondering if getting these will make enough difference in sound on a stock catback or is it a pointless buy?

      • It would not by any means be pointless, replacement of your stock mufflers is always a plus for performance. However if you do not have the equipment, you would still need to take these to a muffler shop to have them cut away the stock mufflers and replace them with these but if you check around you should be able to get these installed for no more than $100 bucks, and it will sound just as good as buying the setup that bolts from the mid-pipe back. I have the SLP setup and I love it, FYI. I will not go back to flow master after experiencing the sound these babies put out.

      Helpful (12) Show 3 more answers

      I have a 02 Mustang GT with forged internals, trickflow stage 2 cams, 24lbs injectors, ford performance i take manifold, 78mm BBK throttle, BBK cold air intake, long tube headers, true dual with flowmaster 40s series, aluminum pullies, aluminum driveshaft... i was thinking installing a x pipe with the slp... the slp will make my mustang sound louder and agressive? And the cams are still going to sound nasty?

      • The SLP Loudmouth Center/Center Shotgun Style Resonators will make your car sound louder and the cams will still sound nasty yes!

      Helpful (3)

      I have a stock 04 Mach 1 with these simply bolt on with clamps to the stock pipes?

      • The SLP Loudmouth Center/Center Shotgun Style Resonators would not be a direct bolt on replacement for stock mufflers, as the stock mufflers will have the inlet and outlet offset on different sides of the muffler case. Modification to the existing exhaust would be required to install these mufflers.

      Helpful (2)

      I have a Borla system on my 03 Terminator right now, O/R X pipe and Long tubes. If I just swapped the Borla mufflers out for these would I need a re-tune? Wouldn't think so but doesn't hurt to ask. Thanks

      • No, these mufflers will not require you to retune your Terminator with long tubes. The current tune for your modifications will be perfect.

      Helpful (1)

      Can i use these on my 08 mustang gt I had them on my 96 gt and i love the sound

      • Unfortunately I would be unable to guarantee fitment on a 2008 Mustang GT. Though these have universal fitment, they are designed to fit 1979-2004 Mustang models only.

      Helpful (1)
      10 More Questions
      Hi I have a 89 notch would the slp fit with my bbk longtube with catted x pipe ? 1 answer
      will these fit on a flowmaster catback system? 1 answer
      What’s the difference between the loudmouth 1 and 2 1 answer
      I just installed some pacesetter long tube headers, and pypes cut and clamp x pipe. My car sounded good before, but now it is high pitched and so raspy I want to sell my car. With these get rid of the rasp and make it deeper? 0 answer
      Anybody put these on s550? How does it sound? 0 answer
      Will these sound better than a resonator delete? I have roush axle back on my 2014 mustang v6 and I’m wondering if this will sound better than just a resonator delete 0 answer
      Can I leave my mufflers in if install these closer to the midpipe? Does it affect anything? 0 answer
      Can these be welded in or how should they be installed? 1 answer
      I have an 05 mustang V6 dual exhaust system. Im looking for a much louder and raspier sound. Will these possibly fit on an 05 seeing theyre made for up to 2004? If so will it sound good? 1 answer
      Can I just put these on a 2012 Challenger RT without the whole cat back system and have it sound the same 0 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

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