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Flowmaster American Thunder Cat-Back Exhaust w/ Polished Tips (87-93 LX; 1986 GT)

Item 18407
Market Price $544.99 You Save 12% ($64.04)
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    Features, Video & Details

    • Aggressive Flowmaster Sound
    • Super 44 Series Mufflers
    • Mandrel-Bent Tubing
    • Durable Aluminized Steel Construction
    • 2.5" Polished Stainless Steel Tips
    • Fits 1987-1993 LX and 1986 GT Mustangs

    Review & Installation Video

    Review & Install Video

    Flowmaster Sound. The Flowmaster American Thunder Cat-Back exhaust system with its mandrel bent tubing will improve your 1987-1993 LX or 1986 GT Mustangs exhaust flow for an increase in power. Their included Super 44 Series Mufflers with attached hangers will improve your exhausts sound for a deeper throatier muscle car exhaust note.

    Quality Construction. Constructed from mandrel bent 2.5" 16 gauge aluminized steel tubing for it's corrosion resistant properties the Flowmaster American Thunder catback features Super 44 Series chambered mufflers with 25" Long by 2.5" diameter OEM style polished stainless steel tips for muscle car looks and sound.

    Application. This Flowmaster American Thunder Cat-Back exhaust system is designed to fit the 1987-1993 LX and the 1986 GT Mustangs for both great looks and great sound.

    Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 Details

    MPN# 17213

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    Hardware included:
    • (2) Clamps, Attached Hangers
    Installation Info
    Tech Specs
    Cat-Back Exhaust Specifications
    Piping Material: Aluminized Steel Tip Material : Polished Stainless Steel
    Piping Size: 2.5" Tip Size: 25"L x 2.5" diameter
    Muffler Type: Chambered Fitment: 87-93 LX and 86 GT Mustangs
    Will it fit my Mustang?

      Customer Photos (10) Submit Your Photo

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        Questions & Answers (6)

        5 Top Rated Questions

        My car currently has coilovers in the factory shock mounting location. Will I be able to run tailpipes?

        I have a 1989 LX 5.0 with all stock exhaust currently. I see the Flowmaster American Thunder Cat-Back Exhaust w/ Polished Tips (87-93 LX; 1986 GT) kit is 2-1/2" diameter. I believe that my stock exhaust is 2-1/4" diameter. How does this work with your product? Thank you very much. Jay

        • The Flowmaster American Thunder Cat-Back Exhaust uses exhaust uses 2 1/2" tubing, however the flanges are designed to mate to the flanges on the OEM 2 1/4" exhaust.

        Helpful (0)

        Will this fit on a 1993 Mustang LX 2.3?

        • Hello! The Flowmaster American Thunder Cat-Back Exhaust will only fit on a V8 LX

        Helpful (0)

        Fitment question Will this catback kit mate up with the bbk catted h pipe and stock headers on my 89 Lx 5.0 ??

        • Yes it will, direct bolt on.

        Helpful (0)

        will this fit an lx shorty catted x pipe?

        • if u have long tube headers into that shorty xpipe then yes this should fit on ur stang

        Helpful (0) Show 1 more answer
        Post Your Question
        1 More Question
        Is the word Flowmaster etched on the stainless tips? I was just wondering if there is an option to have the polished tips with or without the etching. Thanks. 2 answers

          Customer Reviews (25) Write a Review

          Ratings Summary

          4.6 out of 5 overall rating from 25 customers

          Installation Time: Afternoon

          • March 20, 2019

            5 1992 LX - Nad


            Worked well on my car. Will buy again from American muscle. Very reliable parts. Thank you

            Helpful (0)
          • February 26, 2019

            5 1992 GT - Mattyd Installation Time: Afternoon

            Great sound.

            Went from having catted H pipe with slp1 to xpipe and American thunder cat back. This was def the iconic sound I was looking for. My only issue was the clamps that came with it were useless snapped both of them.

            Helpful (1)
          • December 16, 2018

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

            Flowmaster exhaust

            I recently purchase this exhaust system and was a little skeptical at first but after having it installed I was very satisfied. I found it to be not that loud but just right

            Helpful (3)
          • September 18, 2018

            3 1987 LX - Vicm

            Lost power

            I wanted my stang to be louder so I purchased this exhaust system. I didn't need at as mine was already a flowmaster system and was in great shape, I think a sale on the American Thunder made me do it. Anyway, I truly believe I have lost some power, exhaust is loud, at certain steady speeds it resonates inside the car and you either have to speed up or slow down to get rid of that. They are fine but I should have stayed with my other exhaust.

            Helpful (3)
          • August 21, 2018

            4 1993 LX - CharlieB Installation Time: Afternoon

            4 Star kit with 5 Star sound!

            Pros: 1. If you want that amazing "Flowmaster" exhaust note then you have found it. The Super 44's blow away the 40 Series in my opinion. They are a good bit louder but the tone is amazing throughout the entire RPM band. 2. The chrome finish on the tails is extremely nice. Cons: 1. Be prepared to make a trip to the muffler shop. The mufflers need to be opened up on the tail pipe ends so the tails will slip inside of them. Errr! 2. Don't even think about using the wimpy 1/4" clamps that come with the kit. Go to the parts store and pick up some 3/8" clamps for a few bucks. The 1/4"ers will snap easily.

            Helpful (5)
          • February 01, 2018

            5 1986 Other - RT Installation Time: Afternoon

            The Real Deal

            I wanted to make my 1986 5.0 GT look right, sound right, and feel right. This product gave me everything I wanted. When a Fox body Mustang looks right with the polished underhung exhaust tips, sounds just right with the unmistakable ear pleasing Flowmaster Mustang growl, then it magically feels better all over - and so do I! Thanks American Muscle!

            Helpful (7)
          • December 18, 2017

            5 1993 LX - SBW Installation Time: Full Day

            Amazing sound!

            Paired with the Mac Off-road H pipe sounds amazing! True Foxbody sound that we all have come to love! This exhaust is a great set up and fits nicely but you do have to take your time and put it all in and together and make sure clearance is good before tightening anything! My only complaint is my drivers side tip sticks out a half inch further than right side so will have to take to exhaust shop and have them cut 3/8 to 1/2 inch off the part that goes into muffler to get it to match! Takes a full day to install it and H pipe and you will need to either have a lift or jack that will raise it high enough to route tail pipe over axle, I had to take it to mexhanic with lift to get them to install tail pipes due to this issue.

            Helpful (6)
          • November 23, 2016

            4 1989 Other - John Installation Time: Afternoon


            Gives the true 90's mustang sound. I would have given it 5 stars but if your running anything over a 275 rear tire everything gets real cramped but other wise very happy with the polished tips. I would also get this system welded.

            Helpful (7)
          • October 14, 2016

            5 1993 Other - 93supercharged Installation Time: Less than 1 Hour

            The classic musclecar sound i was missing

            This exhaust came really well packaged nice and shiny took about 30 minutes to install really easy and the sound is amazing my last ones where blown out like a tin can it was time to change them and now its less louder but the sound quality is at its finest. I live in canada and it took a week to get here pretty fast. Only think the passenger side muffler is vibrating against the frame a little self initiative help fixed the problem.

            Helpful (7)
          • June 12, 2016

            5 1990 GT - Cbird Installation Time: Afternoon

            American thunder car back

            I installed the American thunder 2 1/2 cat back exhaust in about two hours. The product went together great , but had to put a small weld around the tail pipe because of exhaust leak. I wanted the iconic fox body sound and I got it.

            Helpful (7)
          • April 20, 2016

            3 1992 Other - Copstang Installation Time: Less than 1 Hour

            Fit great

            Great sound, easy to install. Only complaint was cheesy exhaust clamps, broke one and smashed my knuckles. One muffler had a slight dent, but I'm not picky.

            Helpful (7)
          • April 03, 2016

            5 1992 Other - Dannyboy Installation Time: Afternoon

            Excellent sound

            Fit and finish excellent.Took a little tweaking to line but lined up perfectly. recommend installing band clamps instead of the supplied clamps for a cleaner finish . Along with a set of BBK shorty headers and Mac Pro-Chamber exhaust sounds awesome and not too loud.took about and hour to install.

            Helpful (7)
          • August 27, 2015

            5 1986 GT - Mike Installation Time: Afternoon

            Couldn't be happier.

            Paired this with a HP catted midpipe. Sounds awesome!!

            Helpful (7)
          • June 20, 2015

            5 1992 GT - JustinN61 Installation Time: Afternoon

            Awesome sound!

            This is the reason the mustang has that iconic sound. These are a must have for anyone looking to make their car loud. Great flowmaster quality and fit.

            Helpful (7)
          • December 29, 2014

            5 1992 Other - Mean92347 Installation Time: Afternoon

            Flowmaster American thunder

            Great exhaust, purchased this for my 92 lx and American Muscle got it to me in about 2 days. The install was straight forward taking a little over an hour with basic hand tools. The system looks great and sounds even better. I def recommend this system for anybody with a fox mustang looking for some mean grunt.

            Helpful (7)
          • May 15, 2014

            5 1993 Other - airwolf Installation Time: Afternoon

            Great Catback

            before buying this catback i had stock headers mid pipe and super 44 mufflers with the pretty much stock exhuast i wasnt getting much sound out of my exhaust so i decided to upgrade and bought bbk equal length headers, bbk h pipe with high flow cats match all of that up to this catback man what a world of difference car sounds amazing now.

            Helpful (7)
          • May 02, 2014

            4 1991 Other - Tomicino Installation Time: Afternoon

            Sounds Great, But....

            The sound is pretty sweet after a lengthy install on these bad boys. My main problem was the clamps they sent with it. I definitely recommend getting 3/8" clamps to replace the chinsy 1/4" ones they send with the system. Then you can get a good bite down without snapping them from the torque (like I did on one side). The other problem I encountered was the hangers coming off the mufflers and tailpipes don't have a head on them, like my stocker ones did, to keep from slipping off. After a mellow ride I checked them thoroughly for problems. I noticed on one side it slipped off the mounting hanger. To resolve this, I was fortunate to know a welder friend who welded washers to the ends of all the brackets to keep the rubber grommets from slipping off again. After some hit and miss, overall the sound is sweet...especially with the top down! The only other issue I have is why they have the tailpipes going on the inside of the mufflers verses the outer side. But oh well, sounds great and I'm happy. Speedy shipping as always through AM. Good luck and don't forget the 3/8" clamps!

            Helpful (6)
          • August 01, 2012

            5 1993 Other - MustangMike93 Installation Time: Less than 1 Hour

            Great system!

            Had this system in for about a week and its great! Get lots of comments. Its not like super loud were your gonna wake the neighbors but its an awesome performance sound! unfortunately AM didnt have the stainless steel system just the aluminized steel one and me living in MN i had to get stainless but nonetheless this is a great exhaust system. Highly recommend

            Helpful (6)
          • July 27, 2012

            5 1992 Other - Ranchman Installation Time: Afternoon

            great sound

            My 13 year old son and I installed this system on our 1992 Lx Summer edition. We all so used the bbk off road H-pipe . We installed the system in an afternoon,fit well but a hoist would have made it easier. The sound is fantstic,lots of people ask about it.Just need to add the BBK headers to finish it off.

            Helpful (7)
          • July 27, 2012

            5 1992 Other - BiminiBlue92 Installation Time: Afternoon

            The Right Stuff

            Everything you need is in the box. Fits with all factory brackets and hangers. Sounds great! I haven't used my radio since the install; I just listen to the car. Good Flowmaster sound w/o being too obnoxious. The video doesn't do it justice but take a look anyway.

            Helpful (7)

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