1986-93 Ford Mustang Flowmaster American Thunder Stainless Cat Back Exhaust Kit LX - Fox Body - 5.0 by Flowmaster

Mustang Flowmaster American Thunder Stainless Cat Back Exhaust Kit (86-93) 5.0

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Flowmaster Mustang American Thunder Stainless Cat Back Exhaust Kit  (86-93) LX 5.0 817213

Designed for an easy fit, these Mustang exhaust systems include all necessary parts and hardware for easy installation.

Item #FLO-817213
MPN# 817213

Your Price: $545.97

Market Price:$714.85
You Save 23.62 % ($168.88)

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


  • Fully Welded Construction
  • Chambered Muffler Design
  • 409 Stainless Steel
  • Lifetime Warranty
  • Made In The USA

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 Mustang owner 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 Mustang enthusiast who wants their performance to be heard. Like all Flowmaster systems, the American Thunder benefits include improved throttle response, power and mileage.

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 Mustang. "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 proudly made in the U.S.A.

- Fits 1986-93 5.0L Mustang LX & 1986 Mustang GT, will fit 93 Cobra by lengthening the rear tailpipe hangers
- 2.5" Inlet / 2.5" Outlet
- Supper 44 Series Mufflers
- 409 Stainless Steel Construction
- Mandrel Bent 16 gauge Tubing

Flowmaster Exhaust Warranty - Click Here

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  • Product Videos

    Fox Body Mustang Exhaust Kit Installation: Flowmaster Cat Back & SVE Off Road H Pipe

    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!

    Customer Photos (2)

    Product Reviews (6)

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    5 of 5 REVIEWS
    5 of 5 REVIEWS

    5 Stars   Awesome sound, and fit
    By on 4/4/2014
    I was working on my 7 up when I noticed the stock exhaust was rotted out! Well that was the excuse I needed to purchas the flowmasters ! They came to the door in perfect shape and in record time. The installation was a breeze and in no time I was taking the car off the jacks. The sound is great! It's that traditional 5.0 sound that you expect from flowmasters! Thanks to latemodelrestoration for great products, super fast shipping, and awesome customer support!

    Yes, I would recommend this item to a friend!

    Was this review helpful to you?

    5 Stars   flowmaster catback for LX
    By on 1/7/2014
    this system has the iconic mustang sound and the stainless tailpipes look outstanding.

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    5 Stars   Sounds Awesome!!
    By on 8/17/2014
    Image uploaded by Pastor N. It took me a while to decide which Flowmaster cat-back system to buy. Had to get Flowmaster due to the use of my MM Panhard bar system. The sound is outstanding, but the fit could be a little better. These went on my 93 Cobra. The fitting issue was between frame rails and also differential housing. I used extended exhaust tail - pipe hangers due to factory Cobra rear bumper. I will have to go to exhaust shop to modify to my liking. Other than that, it's aftermarket and at times they just don't fit well.

    Yes, I would recommend this item to a friend!

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    4 Stars   Very easy install
    By on 4/21/2015
    Just installed the new cat back system on Sunday. Very easy to install and worked perfectly with my BBK H-pipe. The sound is MUCH loader than the old stock mufflers with the same H-pipe. I like the sound, especially under heavy acceleration. The only complaint is a significant drone at 2200 rpm - no issues above or below that RPM. This is a high quality system. I was the exhaust buyer for Ford Purchasing back in the 80's and 90's and I know a good system when I see it. And yes, I bought all of the original Mustang factory systems!

    Yes, I would recommend this item to a friend!

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    5 Stars   Extremely happy with fit, and classic Flowmaster sound.
    By on 5/2/2016
    Image uploaded by William W. I was quite amazed how well these fit with some minor adjustments. 84 Mustang only came with a single exhaust, but I ordered all the correct hangers and hardware. Holes were already in the correct locations so no drilling to get the hardware to fit. The previous dual exhaust was hacked in and never fit or hung correctly. These are nearly perfect, even running the torque arm and panhard bar from MM, there are no clearance issues.

    Yes, I would recommend this item to a friend!

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    5 Stars   Quality product, great fit.
    By on 6/18/2015
    Well made catback system. Sound in the car is loud, but not too loud. I was unable to install the tailpipes in my garage because I could not safely jack the car up high enough. I took them to a local shop and paid $40.00 to have them put on. No problems with the install other than that.

    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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