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

Item 18407
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      Review & Installation Video

      Product Information

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


      • 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


      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

      Flowmaster 17213

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • (2) Clamps, Attached Hangers

      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

      Customer Reviews (26)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 26 customers

      Installation Time: Afternoon

      • May 03, 2020

        4 1992 LX - Mstg25 Installation Time: Afternoon

        Fitment was tough...

        Mufflers and cat-back piping fit fine, the tailpipes were a bear to try and wrestle into place and ended up with 1 pipe slightly canted. They soud awesome though, worth the price. I suggest doing them on a lift because you just can't seem to get enough leverage while underneath it on jack stands.

        Helpful (0)
      • 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 (4)
      • 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 (8)
      • 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 (7)
      • 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)

      Questions & Answers (6 answers)

      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

      Will It Fit My Mustang

      • LX - 87, 88, 89, 90, 91, 92, 93
      • Other - 86

      Fits 1986 GT and 1987-1993 LX Mustangs

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