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Flowmaster American Thunder Cat-back Exhaust System

1999-2004 Ford Mustang Cobra with 4.6L DOHC engine, 2.5" Stainless Steel

Part # 817248 Be the first to write a review
Estimated shipping date: 03/17/2022
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This American Thunder® cat-back exhaust system is specially designed for the 1999-2004 Ford Mustang Cobra models with the 4.6L engine. The exhaust system is constructed from 2.50-inch mandrel-bent stainless steel and bolts directly to the back of the factory catalytic converters. The inlet tubes flow into a pair of large cased Super 40® "shootout series" performance mufflers. The 2.50-inch tailpipes are all mandrel-bent, use the factory hanger locations for a quick and easy installation and the mandrel-bent tailpipes are finished off with a pair of highly polished 3.00-inch diameter 304 stainless steel tips. The system includes all necessary parts, hardware and easy to follow instructions and is covered by the Flowmaster® Lifetime Limited Warranty.


  • Includes Hangers and Hardware for an Easy Installation
  • Large 3.00-inch Polished 304 Stainless Steel Tips
  • Mandrel-bent 16-gauge Stainless Steel Tubing
  • Connects After Factory Catalytic Converters
  • Uses the Factory Hanger Locations
  • Super 40 Series Shootout Mufflers
  • Moderate Exterior Exhaust Tone
  • Lifetime Limited Warranty
  • Easy Installation

About Flowmaster

Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound.

Brand Flowmaster
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear
Heat ShieldNo
Inlet Diameter (in)2.5
Material409 Stainless Steel
Muffler Part NumberKit Only
Muffler Quantity2
Muffler SeriesSuper 40 Series
Outlet Diameter (in)2.5
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeCat-back
Tip Diameter (in)3
Tip Quantity2
Tubing Diameter (in)2.5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817248

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Fits 1999-2004 Ford Mustang Cobra with 4.6L DOHC engine.

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    Some parts are not legal for use in California or other states with similar regulations.