1987-93 Ford Mustang Flowmaster American Thunder Cat Back Exhaust System GT - Fox Body

Mustang Flowmaster American Thunder Cat Back Exhaust System (87-93)

Details   |  Description   |  Videos   |  Reviews   |  Community Q&A
Mustang Flowmaster American Thunder Cat Back Exhaust System (87-93)
  • Flowmaster Mustang American Thunder Cat Back Exhaust System (87-93) GT
  • Flowmaster Mustang American Thunder Cat Back Exhaust System (87-93) GT
  • Flowmaster Mustang American Thunder Cat Back Exhaust System (87-93) GT

Flowmaster American Thunder Exhaust Systems add a signature growl that's best described as the "Flowmaster Sound" - A muscular, throaty rumble that announces your engine's presence. Flowmaster is the true tone of classic American muscle and performance.

Item #FLO-17116

Your Price: $366.66

Market Price:$428.99
You Save 17.00 % ($62.33)

In Stock!

Add to cart

Shipping Alert!

Due to a warehouse move all wheels & wheel tire kit shipments will be delayed until Monday 12/22.


  • Gives Your Mustang That Signature Sound
  • Increased Performance
  • Improves Exhaust Tone


  • Fully Welded Construction
  • H-Chamber Design
  • Aluminized Steel
  • Black Painted Mufflers
  • Made In The USA
  • Fits 1987-93 GT
  • 3 Year Warranty

What's in the Box

  • (2) Muffler Assemblies With Flow Tubes
  • (2) GT Tailpipes
  • (2) Exhaust Clamps
  • Install Instructions
  • Flowmaster Stickers
  • Warranty Card

Made in the USA

Product Description

For the person who is looking for a complete cat-back dual exhaust system with an aggressive tone for their 1987-93 Mustang GT, this kit is for you. With easy fit in mind, these American Thunder systems from Flowmaster are mandrel bent for maximum performance and include specially selected mufflers. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the American Thunder benefits include improved throttle response, power and mileage. Designed for an easy fit, these Mustang exhaust systems include all necessary parts and hardware for easy installation.

Since Flowmaster mufflers use sound energy cancellation technology, you don't have to worry about "packing material" deteriorating and getting louder after as little as a few months. The interior case volume of the inside of a Flowmaster muffler is far superior to that of a "straight-pipe" or "straight-through" muffler design. Imagine filling a "straight-pipe" or "straight-through" muffler with water vs. filling a Flowmaster muffler with water. Which one do think would hold substantially more volume? The deflector in a Flowmaster muffler acts as a one way check valve eliminating reversion back to the engine and creates a low pressure area to help scavenge the exhaust. Flowmasters unique style of H-Chamber designs help control interior resonance inside the cab area of your vehicles. "Straight-through" muffler designs cannot. Flowmasters use fully welded construction for added strength and durability to last even when installed on high horsepower engines.

Flowmaster mufflers are made in the U.S.A.

- Fits 1987-93 GT 5.0L V8
- 2.5" Inlet / 2.5" Outlet
- Super 44 Series Mufflers
- Aluminized Steel Construction

Product Videos

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Community Q&A

Have a question about this item?
Ask the community

Customer Reviews

out of 5 stars
5 stars
4 reviews
5 stars    4
4 stars    0
3 stars    0
2 stars    0
1 star    0

4 of 4 REVIEWS
4 of 4 REVIEWS

  New Exhaust
By on 1/27/2014
I bought an '89 GT that had an off road Y-pipe with stock mufflers so that all had to go. I bought the BBK cated X-pipe with the Flowmaster Cat back system. Not only did it pass inspection, it sounds great and seems to have a little more low end power. Installation could not have been easier to my existing shorty headers.

Yes, I would recommend this item to a friend!

Was this review helpful to you?

By on 2/3/2014
I wasn't sure if these would fit my 83 but they did with a little modifications. These Flowmaster Cat Backs unleashed the beast in my GT. I just rebuilt my 5.0 which had single exhaust you couldn’t even hear the lope of the cam. The Flowmasters sound awesome with a deep throaty sound. Great price fast delivery thank you Latemodel Restoration.

Yes, I would recommend this item to a friend!

Was this review helpful to you?

  sounds amazing
By on 5/9/2014
Went right in, now my car sounds amazing. Was delivered on time. I will be making more purchases in the near future because of the quality of the products.

Yes, I would recommend this item to a friend!

Was this review helpful to you?

  American all the way
By on 11/7/2014
I have had this exhaust before. Exactly what I remember it to be. Great fit and the loud raspy grumble is amazing. All the snaps and crackles on the deceleration is what a fox body should sound like. Mellow while cruising and wakes you up when your foots in it. I recommend this over all others.

Yes, I would recommend this item to a friend!

Was this review helpful to you?

Vehicle Applications

Ford Mustang - 1987 (87) - 1988 (88) - 1989 (89) - 1990 (90) - 1991 (91) - 1992 (92) - 1993 (93)

About This Brand

Flowmaster - The Exhaust Technology Company
Flowmaster operates the only exhaust Research & Design facilities of its kind in the world, centered around the SuperFlow SF-7100 engine dynamometer complete with E.C.A. (engine cycle analysis) equipment and also SuperFlow chassis dyno's.

Through use of these dyno's, Flowmaster's engineering staff can track the complete engine cycle in millionths of a second and can obtain exact technical data of each degree of cam rotation, from induction to the tip of the exhaust system, while also showing the power numbers that really matter, the power numbers "to the ground."

Flowmaster also utilizes Spectrum Analyzers to fine "tune" the sound of each of the eleven different series of mufflers that Flowmaster currently offers, both for peak performance and just the right sound levels and tones. Flowmaster's dedication to quality is what makes them the exhaust industry leader for Latemodel Mustangs and SVT Lightnings!

Look for Similar Items by Category

1979-1993 Mustang Parts » 1979-1993 Mustang Exhaust » 1979-1993 Mustang Cat Backs & Tailpipes
Top Mustang Performance Mods » 1979-93 Mustang Top Performance Mods

Products by Vehicle