Free Shipping On Orders Over $49. Details

Talk to a Mustang Expert
1-877-887-1105
Every day 8:30AM EST - 11:00PM EST
Win Any Wheel & Tire Package! Enter Daily

Flowmaster American Thunder Cat-Back Exhaust (87-93 GT)

Market Price $505.99 You Save 12% ($58.83)
Our Price

$447.16

FREE Shipping

  • Item 18405
  • MPN# 17116

Will this fit your Vehicle?

In Stock Ships same business day.
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features & Details

    • Aggressive Flowmaster Sound
    • Super 44 Series Mufflers
    • Mandrel-Bent Tubing
    • Durable Aluminized Steel Construction
    • Fits 1987-1993 GT Mustangs
    Flowmaster Sound . The Flowmaster American Thunder Cat-Back exhaust system with its mandrel bent tubing will improve your 1987-1993 GT Mustangs exhaust flow for an increase in power, and their included Super 44 Series Mufflers 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 for that classic muscle car sound.

    Fitment. This Flowmaster American Thunder Cat-Back exhaust system is designed specifically for the 1987 to 1993 GT Mustangs for both great a fit and great sound.

    Fitment: 1987 1988 1989 1990 1991 1992 1993 Details

    CA Residents: Warning: California's Proposition 65

    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 : Aluminized Steel
    Piping Size: 2.5" Tip Size: N/A
    Muffler Type: Chambered Fitment: 87-93 GT Mustangs
    Will it fit my Mustang?

    You Might Also Like

    Customer Photos (3) Submit Your Photo

    View All 3 Photos

    Questions & Answers (3)

    3 Top Rated Questions

    Hi will this exhaust fit my 88 gt 5,0 convertible

    • The Flowmaster American Thunder Cat-Back Exhaust (87-93 GT) will fit your 1988 GT convertible. This exhaust will fit any GT from 87-93.

    Helpful (1)

    Will this Catback mount to a stock h-pipe?

    • Yes it will! I just installed the cat back kit to a completely stock 91 GT.

    Helpful (1)

    Will the American Thunder Catback exhaust system fit with BBK's long tube headers?

    • The Flowmaster American Thunder Cat-Back Exhaust are design to mount in the factory mid-pipe location. The BBK long tubes and mid-pipe meet in the stock location, so this cat-back will work well.

    Helpful (0)
    Post Your Question

    People Who Bought This Item Also Bought

    Customer Reviews (29) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Loudness / Volume 4.476191 4.5
    • Exhaust Note 4.857143 4.9
    • Fit & Finish 4.571429 4.6
    • Bang For Your Buck 4.714286 4.7



    • 2/5

      Installation Time: Afternoon

      September 13, 2018

      sound great fit awful

      i love the iconic sound of the flowmaster but they fit awful they need to be cut shorter if you dont want them to bang on the floor or the gas tank

      GregF

      Year: 1987 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      May 11, 2018

      no back fires

      the fit was perfect, I really thought I would have to make this work, awesome look and sound, I look at the under carriage and all I see is this cat back system tucked away as I lowered this Fox body. I tack welded the mufflers and it's been going great for the last year.

      CarlosG

      Year: 1993 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      February 06, 2018

      Exhaust

      Great buy love the sound and very loud too! If u get this one u would be very satisfied with purchase

      BernardC

      Year: 1990 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      August 28, 2017

      It's flowmaster...nuff said

      Putting this exhaust in took me about 2.5 hours on my back in my garage. That includes cutting out the old. It's the signature flowmaster sound we all know and love.

      DanielK

      Year: 1990 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      January 24, 2017

      True American Thunder

      Combined with BBK midpipe headers and this makes the most wicked sound. It has a deep/bass howl and has crackling backfire. Install is very easy for the American Thunder and it lives up to its name!

      P

      Year: 1993 Submodel: GT

      Helpful (4)

    • 4/5

      Installation Time: Afternoon

      December 17, 2016

      Great

      Great purchase and sounds great but the clap isnt really doing very well ended up welding everything so good luck with your installation

      Matthewlampert

      Year: 1992 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      November 09, 2016

      Great sounding exhaust

      received the exhaust within two days, awesome! Took a couple of hours to install and sounds great. Very happy with this purchase

      Bob

      Year: 1989 Submodel: GT

      Helpful (3)

    • 4/5

      August 03, 2016

      Easy install

      Exhaust went on very easy. Also gave a nice Rumble to the car sounds like it should the only negative thing is the hardware is very weak that comes with the kit. Other than that I would have given it 5 stars

      oxford1970

      Year: 1989 Submodel: GT

      Helpful (3)

    • 5/5

      July 21, 2016

      Flowmaster Cat Back

      Love my Flowmaster Cat Back exhaust. Fit perfectly and sounds great. Installation was a breeze. Came with eveything I needed. Thanks American Muscle.

      Zeus

      Year: 1988 Submodel: Other

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      December 23, 2015

      A unbelievable deal!!!

      I love this exhaust sounds excellent. Was quick to install looks good coming out the tail of my car. Just a overall good buy, reasonable price, and shipped very fast. I love it!!!

      Faithfully973

      Year: 1991 Submodel: GT Newark, Nj

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      January 07, 2015

      American Thunder for the perfect sound

      This kit came with everything I needed for a smooth install and a perfect fit. The sound is dead on what i wanted when I ordered this product (which got to my house very quickly AND FREE!). The sound is the perfect Mustang sound that I dreamt of.

      nickb61

      Year: 1991 Submodel: GT Athens, GA, USA

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      June 30, 2014

      Easy install.

      My Flowmaster cat back system arrived quickly as my orders usually do from American Muscle. I installed the system in my 1989 Mustang GT in my driveway. The fit was great as usual.

      a50ina50

      Year: 1989 Submodel: GT Delran, New Jersey

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      May 05, 2014

      Great fit, fast shipping

      Great exhaust, was on sale. Fit with no issues. Great sound, as always with flowmasters. Shipping was fast to Canada Thanks AM!.

      Moore

      Year: 1990 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      August 19, 2013

      great sound

      this system makes a HUGE difference. after a few weeks i added an o/r h-pipe an WOW just about every where I go I get compliments and look's. With an o/r h-pipe an about 2000-2500rpm they have quite a bit of drone but it sounds awesome. And at an idle they can't be beat. needless to say my neighbors know when I leave for work, but at the same time can be kept quiet.

      Bryanthehunter

      Year: 1987 Submodel: GT Kent, WA, USA

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      August 15, 2013

      excellant sound

      My mustang has that distinct mustang sound now. Mean and powerful.

      kkuz87

      Year: 1987 Submodel: GT Barrington, IL, USA

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      July 04, 2013

      Love this Flowmaster catback exhaust!

      My mechanic said the installation went without a single hitch. This system really releases the wild side of my 'stang. I absolutely love the deep, resonant "Flowmaster" tone this system produces. At speed, there is no droning. I have only had this system installed a couple of days now, and have received numerous compliments on how nice the car sounds. Thanks to Flowmaster, and American Muscle, for an outstanding product.

      Garcon

      Year: 1987 Submodel: GT Kendallville, IN, USA

      Helpful (2)

    • 5/5

      Installation Time: Full Day

      June 23, 2013

      Exactly what I wanted.

      Combined with the BBK off road x pipe this system gave my mustang the exact sound I was looking for. We did the entire header back exhaust and smog pump delete in about 6 hours. Love the set up!

      JayV

      Year: 1990 Submodel: GT MA

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      August 02, 2012

      great sound

      Item is greatly priced and sounds great. Highly recommended.

      chris92convertible

      Year: 1992 Submodel: GT Staten Island, NY, USA

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      July 27, 2012

      FLO-DRONE!!

      This is an amazing exhaust that went right in. When it showed up in smaller boxes I thought it would be hard work but it bolted right in. I used the Pypes Catted X-Pipe (79-95 5.0L) and Ford Racing Double Hump Adjustable Transmission Crossmember with it. I went home from work with an exhaust leak and plugged cats, tinkered in the garage for an afternoon, and went back the next day turning heads and getting compliments. This is an awesome upgrade at a fantastic price. I won't go anywhere else for parts.

      KleineAngst

      Year: 1985 Submodel: GT Ogden, UT, USA

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      July 26, 2012

      PONY UP and get the American Thunder cat-back system!

      If you want your fox body 5.0 Mustang to SOUND like a Mustang, buy this product. NOW! I have an '89 convertible with a 5 speed, and I LOVE the sound with the top up AND down. Now, when I'm rollin' in my 5.0, with my rag-top down so my hair can blow #thanks Vanilla Ice#...it is clear that an 80's muscle car is on its way. Thanks American Muscle for great products and great pricing!

      GT4TB

      Year: 1989 Submodel: GT Apple Valley, MN, USA

      Helpful (1)

    Related Mustang Categories