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Flowmaster - American Thunder Cat Back Exhaust System (817587)

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You save: $264.09 (23%) off MSRP

Ships directly from manufacturer
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This part fits

  1. 2014 Ford Mustang GT 5.0L V8 cid:302 cc:4951
  2. 2013 Ford Mustang GT 5.0L V8 cid:302 cc:4951
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About this product

Part #: 817587

For the serious enthusiast who is looking for all the performance benefits of a complete Cat-back dual exhaust system, this is it. As an American Thunder system, it delivers an aggressive exterior sound level and a moderate interior tone that is suited to the enthusiast who wants to be heard. With maximum performance and easy fit in mind, the system is mandrel bent and includes specially engineered mufflers featuring Delta Flow technology. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for a simple installation. Note: does not fit GT500.

More Details

Automotive Item GradeHigh Performance Part
Bullet Point #1Mandrel bent 16 gauge stainless steel tubing
Bullet Point #2Aggressive Sound Exterior Exhaust Tone
Bullet Point #3Header-back System
Bullet Point #4Flowmaster quality
Exhaust SeriesAmerican Thunder
Exhaust TypeSingle
Exit PositionDual Rear Exit
Exit StyleStraight
Heat ShieldNo
Heat Shield AttachedNo
Inlet Diameter3
Inlet Diameter (in)3
Inlet Inside Diameter (in.)3
MaterialStainless Steel
Muffler Count2
Muffler Part NumberKit Only
Muffler Quantity2
Muffler Series60 Series
Outlet Diameter3.0 in.
Outlet Diameter (in)3
Outlet Outside Diameter (in.)3
Single DualDual
Single or DualDual
Sound LevelAggressive Sound
System TypeCat Back
System TypeCat-back System
Tip Diameter (in)4
Tip Diameter (in.)4
Additional Documents
  1. Certificate of Originpdf
  2. Installation Instructionspdf
  3. Warrantypdf

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  • California prop 65 warningWARNING: Cancer and Reproductive Harm www.p65warnings.cs.gov

    *Some manufacturer restrictions apply.

    About Flowmaster

    Manufacturer of performance exhaust systems, mufflers, cold air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels.

    Benefits of adding this mod

    An upgraded exhaust system is one of the easiest modifications that offers an immediate, noticeable performance improvement. Whether you’re cruising an M3 or modding a diesel truck, an upgraded exhaust will open up the restrictive factory system, allowing your engine to breathe better and deliver peak power! From lighter weight exhaust headers to improved cat-back systems, to better sounding mufflers, modifying your exhaust setup is a great place to express the character of your ride in a unique and cost effective way. Whatever you’re looking for in a modified exhaust system, we can provide the absolute best systems to make your vision a reality.


    we ship worldwide!

    Based in California with 3 warehouses across the country, we’re sending out shipments everyday of the week, even Saturdays. Because your next mod shouldn’t have to wait.

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    Have a question? Ask an Expert!

    Finding the best parts can be tricky

    - but not to worry! Our team of experienced American Muscle, JDM, Euro, and off-road tuners are ready to answer your questions (as long as we’re not in the garage wrenching on our own builds).

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    Ask our expert tuners anything!
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    1 (800) 959-4304
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    Matt Farah

    Smoking Tire / The Drive

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    Thank you for all the help, really. You guys are awesome. This is all great info and I really appreciate everything you have done to help me with my build.

    James M.

    Ford Focus ST

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    Your customer service is wonderful. Thank you for taking care of this. My review will express all. Thank you!

    Wallace R

    Chevrolet Silverado 1500