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1986-93 Ford Mustang 5.0 Flowmaster American Thunder Cat Back Exhaust System LX - Fox Body

Overview   |  Benefits   |  Features   |  In the Box   |  Description   |  Videos   |  Customer Photos   |  Reviews
Mustang Flowmaster American Thunder Cat Back Exhaust System (86-93) 5.0
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-17213

Your Price: $392.60

Market Price:$439.99
You Save 12.07 % ($47.39)

In Stock!  


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


  • Fully Welded Construction
  • H-Chamber Design
  • Aluminized Steel
  • Made In The USA
  • Fits 86-93 LX will fit 93 Cobra with Minor Modifications
  • 3 Year Warranty

What's in the Box

  • (2) Muffler Assemblies With Flow Tubes
  • (2) Tailpipes with Stainless Steel Tips
  • (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. 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 1986-93 LX will fit 93 Cobra with minor modification
- 2.5" Inlet / 2.5" Outlet
- Super 44 Series Mufflers
- Aluminized Steel Construction
- Stainless Steel Tips

Product Videos

More videos of this product!

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!

(3) Customer Photos

Customer Reviews

5 stars
5.0 out of 5 stars - based on 7 reviews

  Sounds great
By on 3/25/2014
Bought this system for my 93 cobra, it fit great with the cobra extended tailpipe hangers. Great classic sound and the polished tailpipes look good.

Yes, I would recommend this item to a friend!

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  Good Fit
By on 3/24/2014
Looks and sounds great!!

Yes, I would recommend this item to a friend!

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  Great fit and sound! LatemodelRestoration.com Expert Review!
By on 4/29/2014
The catback on my car was welded together all funky and had black tailpipes. I put on wider 10" wheels in the back and the old tailpipe was melting the tire. I put this Flowmaster kit on the car and gained the clearance needed for my tire and also got the crisp, classic sound that Flowmaster gives you.

Yes, I would recommend this item to a friend!

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  Sounds great, classic Flowmaster!
By on 6/23/2014
My vintage 1990 OE catback finally failed and I'd had a similar system on my last Fox body. With the OE system the car sounded like an old school bus. Now it sounds like a Mustang! Happy with the purchase.

Yes, I would recommend this item to a friend!

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  Looks awesome and sounds great
By on 6/13/2014
Went together easily. Has a good rap when you accelerate but a good mellow tone when you're cruising.

Yes, I would recommend this item to a friend!

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  car restoration
By on 5/9/2014
Bought the item to replace the old warn out part on my 88 convertible mustang

Yes, I would recommend this item to a friend!

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By on 6/25/2014
fit allmost perfect sound good nice tips

Yes, I would recommend this item to a friend!

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Vehicle Applications

Ford Mustang - 1986 (86) - 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!

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