The new Flowmaster American Thunder system is here for the ’99-’04 Ford Mustang GT 4.6l,Mach 1, and Bullitt. Owners can choose from the standard aluminized kit or Flowmaster’s new 409S stainless steel kit.

Official Release

Flowmaster American Thunder system for 1999-2004 Ford Mustang GT 4.6l/Mach I/Bullitt

Looking for that great go-fast sound from your 1999-2004 Ford GT, Mach I or Bullitt Mustang? Now owners of these great muscle cars have the choice of standard aluminized kit construction or Flowmaster’s new 409S™ stainless steel kit (PN817312). Both kits deliver that great Flowmaster signature sound, improved throttle response and increased performance.

• Available in 409S stainless steel or standard aluminized kit

• Great go-fast sound

• Improved throttle response

• Increased performance

Contact Information



Phone: 1-800-544-4761

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