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

Item 23029
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      Product Information

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


      • 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 -


      Customer Reviews (20)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 20 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • December 19, 2019

        5 1989 GT - BBKPipe Installation Time: Afternoon


        The sound is awesome! I love the rumble sound from these pipes.

        Helpful (1)
      • July 11, 2019

        5 1991 GT - Manonfire


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

        Helpful (0)
      • December 26, 2018

        5 1987 GT - ChrisS Installation Time: Afternoon

        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.

        Helpful (2)
      • July 12, 2018

        5 1990 GT - David Installation Time: Less than 1 Hour

        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.

        Helpful (3)
      • April 10, 2018

        5 1987 GT - Connor Installation Time: Less than 1 Hour

        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!

        Helpful (4)
      • December 29, 2017

        5 1991 GT - Dan

        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.

        Helpful (3)
      • July 15, 2017

        5 1986 Other - Ian Installation Time: Less than 1 Hour

        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

        Helpful (3)
      • April 29, 2017

        5 1988 GT - Zackbreezy Installation Time: Afternoon

        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!

        Helpful (3)
      • February 08, 2017

        5 1991 GT - Granados Installation Time: Afternoon

        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...

        Helpful (6)
      • June 02, 2016

        5 1990 GT - Jeremiah Installation Time: Less than 1 Hour


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

        Helpful (3)

      Questions & Answers (8 answers)

      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

      Installation & What's in the Box

      Installation Info

      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

      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

      • GT - 87, 88, 89, 90, 91, 92, 93
      • LX - 87, 88, 89, 90, 91, 92, 93

      Fits GT Only

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