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

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

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

The Flowmaster American Thunder exhaust system includes all necessary parts to increase the performance and sound in your 86-93 Mustang LX!

Item #FLO-817213
MPN# 817213

Your Price: $545.97

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

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  • Signature Flowmaster Sound
  • Increased Performance
  • Improves Throttle Response
  • Lifetime Warranty


  • 2.5" Mandrel Bent Tubing
  • American Thunder Mufflers
  • 409 Stainless Steel
  • 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

Flowmaster American Thunder Cat Back
Add Flowmaster's signature sound to your Fox with this 1986-1993 Mustang LX American Thunder cat back! With easy fit in mind, these American Thunder systems from Flowmaster are mandrel bent for maximum performance and flow! 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!

Flowmaster Quality
Flowmaster mufflers are proudly made in the U.S.A. and the quality shows in this American Thunder cat back. Constructed with 2.5", mandrel bent tubing, this cat back flows much better than your factory exhaust. Flowmaster utilizes 409 stainless steel to ensure long lasting performance! Designed for an easy fit, these Mustang exhaust systems include all necessary parts and hardware for easy installation.

-Fits 1986-1993 Mustang LX

Flowmaster Exhaust Warranty - Click Here

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    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!

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    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!

    Was this review helpful to you?

    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!

    Was this review helpful to you?

    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!

    Was this review helpful to you?

    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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