1999-04 Ford Mustang Cobra 4.6L - American Thunder Cat-back Exhaust SystemYouTube Button

Flowmaster American Thunder Cat-back Exhaust System

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

PART# 817248

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


This American Thunder® cat-back exhaust system is specially designed for the 1999-2004 Ford Mustang Cobra models with the 4.6L engine. The full stainless steel 2.50-inch system bolts directly to the back of the factory catalytic converters and flows into a pair of Super 40® Shootout performance mufflers. The 2.50-inch tailpipes are all mandrel-bent and use the factory hanger locations for a quick and easy installation, and the 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
  • 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


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

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


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