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Flowmaster American Thunder Cat-Back Exhaust (2013 BOSS 302)

AmericanMuscle no longer carries the Flowmaster American Thunder Cat-Back Exhaust (2013 BOSS 302). Please check out 2010-2014 Mustang Cat-Back Exhaust for an updated selection.
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Flowmaster American Thunder Cat-Back Exhaust (2013 BOSS 302)
1 Reviews 3 Answers

Features & Details

  • Aggressive Flowmaster 60-Series Delta Flow Sound
  • Durable 409 Stainless Steel Construction
  • 3" Mandrel-Bent Tubing
  • 4" Polished Stainless Steel Tips
  • Includes Two Flowmaster 60 Series Mufflers
  • Fits 2013 BOSS

Product Resources

Customer Photo (1) Customer Review (1) Questions (3) & Answers (3)
Signature Flowmaster Sound. Give your BOSS Mustang that unmistakeable Flowmaster sound with the American Thunder Cat-Back Exhaust system from AmericanMuscle. The Flowmaster American Thunder Cat-Back Exhaust with its mandrel bent tubing will greatly improve your Mustangs exhaust flow for an increase in power, and the included 60 Series Delta Flow Mufflers will improve your exhausts sound for a deep aggressive muscle car exhaust note.

Reuses Stock Cats. The included Flowmaster Scavenger X-Pipe bolts up directly behind the stock catalytic converters with no cutting required saving you time and money. By reusing your stock catalytic converters, you ensure that your Mustang is smog-legal.

Quality Construction. Constructed from durable 3" 16 gauge 409 stainless steel tubing for it's corrosion resistant properties the Flowmaster American Thunder Cat-Back features two 60 Series Delta Flow American Thunder mufflers with massive 4.0" diameter polished stainless steel tips for impressive muscle car looks and sound. As an added bonus the tips are embossed with the "Flowmaster" logo for true custom styling.

Application. This Flowmaster American Thunder Cat-Back exhaust system is designed to fit the 2013 5.0L coyote Powered BOSS Mustang equipped with either aftermarket shorty headers or the stock manifolds. Does not fit GT or Shelby GT500 models.

Fitment: 2013 Details

MPN# 817589

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

What's in the Box
  • (1) H-pipe
  • (2) Over-axle pipes
  • (2) Muffler assemblies
  • (4) Clamps
  • Installation hardware
Installation Info
Tech Specs
Axle-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished Stainless Steel
Piping Size: 3.0" Tip Size: 4.0"
Muffler Type: Chambered Fitment: 2013 BOSS
Will it fit my Mustang?

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Questions & Answers (3)

3 Top Rated Questions

Does this not fit 11-14 Mustangs with the Boss Quad Exhaust?

  • This Flowmaster American Thunder Cat-Back exhaust system is designed to fit the 2013 5.0L coyote Powered BOSS Mustang equipped with either aftermarket shorty headers or the stock manifolds. We can not guarantee it's fitment on other models.

Helpful (0)

Is it possible that this exhaust will fit my 2012 boss?

  • The Flowmaster American Thunder Cat-Back Exhaust fits 2013 BOSS Mustangs Only. Designed to be used with the stock manifolds or aftermarket shorty headers installed.

Helpful (0)

With this exhaust do I need a tune

  • You do not necessarily need a new tune with this exhaust, though it is a good idea to get one. A new tune will ensure you are getting the max power from this exhaust since it allows more air flow.

Helpful (0)
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Customer Reviews (1) Write a Review

Overall Rating 5

out of 5 stars

Installation Time:Full Day

  • Loudness / Volume 5 5
  • Exhaust Note 5 5
  • Fit & Finish 5 5
  • Bang For Your Buck 5 5



  • 5/5

    Installation Time: Full Day

    April 20, 2018

    Sounds deep and mean

    Of NOTE: I installed this system on my GT500 with Ford Performance Quad Exhaust. That said : This system is different than the regular Mustang Cat Back from Flowmaster. Anyone who knows Flowmaster, knows there is a HUGE difference in sound between the 4" case mufflers (40's, 60's, 10's and sUper 10's, as well as the 44's) and the 5" case mufflers (such as the Super 40's and the HD and some of the race 30's). This system uses a modified Super 40 muffler and all 3" tubing. There is a tuning chamber (like a bass port in a subwoofer to minimize resonance) but otherwise, the mufflers are Super 40's. The system is quiet at idle, with a DEEP but mellow note and then gets louder and holds the deep note all the way through 7,000 RPM. I get compliments everywhere I go!

    mustbbrent

    Year: 2013 Submodel: GT500

    Helpful (8)

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