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SLP Loudmouth Cat-Back Exhaust (86-93 GT)

Item 23029
Market Price $519.95 You Save 4% ($20.00)
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    Features & Details

    • Rich, Throaty Exhaust Tone
    • Loudmouth "Shotgun" Race Resonators Included
    • Versatile Modular Design
    • 2.5" 409 Stainless Steel Tubing
    • Polished 304 Stainless Steel Turn-Down Tips
    • Fits 1986-1993 GT Mustangs
    More Power and Sound. This SLP system includes SLP's infamous Loudmouth "shotgun" race resonators that offer virtually no exhaust flow restrictions to free up more horsepower and to produce the most aggressive sound possible.

    Modular Design.   SLP's unique modular design allows you to quickly and easily switch out the mufflers or resonators to suit your driving needs. Along with the included resonators, the Loud Mouth system is compatible with all SLP mufflers and resonators including the bullet-type Loud Mouth II and the traditional-style PowerFlo Muffler.

    Superior SLP Construction. This SLP Cat-Back system is made from mandrel bent 2.5" 409 stainless steel tubing for its excellent non-restrictive flow characteristics and long life. The system ends with brightly polished 304 stainless steel turn-down tips, that exit in the stock location giving a great finishing touch and a show quality look.

    Application. Designed as a direct bolt on, this SLP Loudmouth catback will bolt straight up to the factory Mid-Pipe without any modifications required on the 1986 to 1993 GT Mustangs to give it a rich, throaty sound.

    NOTE: Includes Loud Mouth resonators. Loud Mouth II and PowerFlo mufflers sold separately!

    Fitment: 1987 1988 1989 1990 1991 1992 1993 Details

    MPN# M31016

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (2) Front Intermediate Pipes
    • (2) Mufflers
    • (2) Mid Intermediate Pipes
    • (2) Tail Pipes
    • (2) Tips
    • (2) Hangers
    • (2) Ball Flanges
    • (8) 2.5" Band Clamps
    Installation Info
    Tech Specs
    Cat-Back Exhaust Specifications
    Piping Material: 409 Stainless Steel Tip Material : Polished 304 Stainless Steel
    Piping Size: 2.5" Tip Size: NA
    Muffler Type: Straight-through Fitment: 1986-1993 GT Mustangs
    Will it fit my Mustang?

      Customer Photos (6) Submit Your Photo

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        Questions & Answers (8)

        5 Top Rated Questions

        Will this exhaust system bolt up to the bbk off road H pipe?

        • Yes, The SLP Loudmouth Cat-Back Exhaust will be compatible with the BBK Off road H pipe.

        Helpful (2)

        Are these the SLP 1s? I have a completely stock 89 so will this bolt right on with no issues?

        • Yes, this is the SLP 1, and will be a direct bolt on for a stock 1989 model.

        Helpful (0)

        Do the 02 sensors come with the loud mouth kit?

        Will this catback work with 17 x10 wheels?

        • This cat-back will work with all 86-93 Mustang GT models.

        Helpful (0)

        Will these fit on a 92 lx?

        • The SLP Loudmouth Cat-Back Exhaust will not fit a 92 LX. It will only fit 86-93 GT Mustangs.

        Helpful (0)
        Post Your Question
        3 More Questions
        I got this system for my 93 gt a while back and it sounds great. Recently I purchased a 93 cobra bumper and spoiler from AM. My question is, does AM offer the LX slip tips that would work with the cobra bumper. If not could AM help me locate some. Thanks in advance. 1 answer
        I have an 86 GT that I would really like to purchase this exhaust system for. From my understanding, the 86 GT's exhaust tips are only straight tips. I was wondering if you offer the straight tip option for the 86 GTs in this system. (I know flowmaster offers the straight tips in their packet for free). If you can let me know, I would appreciate it. Thank you. 1 answer
        what comes in the box 1 answer

          Customer Reviews (19) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:$100-$250

          • Loudness / Volume 4.9375 4.9
          • Exhaust Note 4.8125 4.8
          • Fit & Finish 4.9375 4.9
          • Bang For Your Buck 4.6875 4.7

          • 5/5

            July 11, 2019


            Awesome deal! Cannot wait until I can tear up the road.


            Year: 1991 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            December 26, 2018

            Looks good

            I'm still building the car so I haven't had the chance to start it yet, but I'm happy with the way everything fit and looks. I'm sure it will sound amazing when I do start it up.


            Year: 1987 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Less than 1 Hour

            July 12, 2018

            Great product

            Install was a breeze. Looks really good. Made my mustang sound so much tougher than the flowmaster that was on it. Noticeable increase in horsepower.


            Year: 1990 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            April 10, 2018

            Awesome sound!

            I have a 1987 GT, I wanted my car to be loud and I came across the SLP loudmouth cat-back exhaust, this exhaust made my car sound so much meaner and louder!


            Year: 1987 Submodel: GT

            Helpful (4)

          • 5/5

            December 29, 2017

            exhaust upgrade

            If you're looking to upgrade to a nice cat-back system that is both loud and free-flowing, this is it. Delivered quickly and installed in about 1 1/2 hours in my garage with just jack stands. It certainly opened up my exhaust and freed up some extra HP. It sounds great at idle and you can cruise without being too loud, but when you get on it, it absolutely roars. Can be a bit raspy at high RPMs, but overall very happy with it. Easy to install and adjust, looks really nice under the car, and gives it that head-turning sound. I went from a Mac-back system that seemed to be a bit restrictive once I got into 3rd and 4th gear. Running BBK Long tubes to BBK O/R h-pipe to the SLP cat-back.


            Year: 1991 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            July 15, 2017

            Sounds Amazing

            This is a great stainless cat-back exhaust for the money. Easy installation, and not alot of drone when crusing. Nice loud muscle car sound when you put your foot into it


            Year: 1986 Submodel: Other

            Helpful (3)

          • 5/5

            Installation Time: Afternoon

            April 29, 2017

            Exactly what I wanted

            This exhaust setup was exactly what I was looking for sound wise. I had flowmasters before and these blow them out of the water. I recommend these to anyone looking for a deep throaty sound!


            Year: 1988 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Afternoon

            February 08, 2017

            SLP loudmouth catback exhaust is very LOUD!

            If you are looking to make your stock mustang loud this is all you need to buy! I have a 1991 mustang gt bone stock h pipe and everything else ha.. I just purchased this and they are nice pipes looks good under car comes with everything you need to install it yourself and very nice sound I was looking for. Turns heads. Will purchase more Mods from AM fast FREE shipping good deal...


            Year: 1991 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Less than 1 Hour

            June 02, 2016


            Loudmouth lives up to its name, Loud. Sounds great and was easy to install. Quick shipping, thank you AM


            Year: 1990 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            October 04, 2015

            just what i was looking for.

            I am very pleased with my new exhaust. SLP did a great job putting this system together. It took about an hour to install because everything bolted right up. Made a huge difference over my factory tail pipes. Thanks american muscle for the quality parts and service you offer.


            Year: 1993 Submodel: GT boiling springs sc

            Helpful (4)

          • 3/5

            Installation Time: Afternoon

            May 29, 2015

            Worth the money

            My first time intalling from off-road pipe back very easy to put together and sound great.


            Year: 1989 Submodel: GT Vestal, NY

            Helpful (3)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            December 29, 2014

            SLP Loudmouth Catback Exhaust

            Combined with a MAC H Pipe, it's exactly what I wanted. Have SLP on another Mustang and I love them both.


            Year: 1993 Submodel: GT New London, NC 28127, USA

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            October 07, 2012


            One of the tips may seem to be longer and you may need to have a shop to adjust some lignment,so that it may be evenly with the other chrome tip. Then you may want to replace your cats and headers to make it even louder.


            Year: 1987 Submodel: GT Clarksville, TN, USA

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            September 21, 2012

            Badass exhaust

            This is the third SLP loudmouth exhaust I have owned, they never let you down, beautiful sound, and great throttle response.


            Year: 1992 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Afternoon

            March 01, 2012


            I love this system, with the o/r h-pipe nobody wants to drive next to me on the road. It looks good and sounds great.


            Year: 1993 Submodel: GT Fayetteville, NC

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            December 07, 2011

            I love the sound

            Cheaper than most cat back systems and way better. easy to install. I got pulled over once and the cop asked me what I had for exhaust cause he wanted it for his mustang!


            Year: 1989 Submodel: GT Stockton, CA

            Helpful (9)

          • 5/5

            November 01, 2010

            Lovin it!

            I love the way this kit sounds! Has a very aggressive tone and will definitely make your 5.0 stand out from the Flowmaster crowd. Easy to install, took about an hour on a lift to install, including a Pypes 304 SS O/R X-pipe. Only thing I didn't like was that I could not make the exhaust tips point out from under the car, they're hidden by the bumper. Other than that I give it 5* for an excellent product at a great price!

            Sean Miller

            Helpful (12)

          • 5/5

            October 26, 2009


            sounds wicked, unique sound, better than flowmasters, if you wanna stand out in the pack get this catback, i love it.


            Helpful (24)

          • 5/5

            November 05, 2007

            i rate this product a 5

            It\'s a really good exhaust system, it not only improved the way my Mustang sounds, it also improved air flow which gave me added horse power.


            Helpful (19)

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