“Flowmaster 99-04 Mustang GT American Thunder Cat-Back Exhaust System”
“Fits 1999-2004 Ford Mustang GT, MACH1 and Bullitt models (not Cobra) with 4.6L SOHC engine.”
Confirm fitment with the part number before ordering.
Product information
Manufacturer information. Check the part number and installation requirements for your vehicle.
Supplier details checked 2026-09-23 · Test catalog
Product description
1999-2004 Ford Mustang GT, MACH1 and Bullitt models with 4.6L SOHC engine. - Moderate sound
Flowmaster American Thunder Cat-back Exhaust System
Features
Includes Hangers and Hardware for an Easy Installation
Large 3.00-inch Polished Stainless Steel Tips
Super 40 Series Performance Mufflers
Over 35+years of Flowmaster Quality
Dyno Tuned for Maximum Performance
Uses the Factory Hanger Locations
Moderate Exterior Exhaust Tone
Easy Installation
Manufacturer notes
Fits 1999-2004 Ford Mustang GT, MACH1 and Bullitt models (not Cobra) with 4.6L SOHC engine.
Supplier category
Exhaust, Mufflers & Tips
Supplier subcategory
Catback
UPC / barcode
700042017683
Units per product
1
Supplier Proposition 65 status
Y
Supplier EPA status
N/A
Air freight prohibited
No
Not CARB approved
No
CARB acknowledgement required
Yes
Freight delivery required
No
Powersports product
No
More manufacturer information
Other product descriptions
Flowmaster 99-04 Mustang GT American Thunder Cat-Back Exhaust System
SYS 99-04 MUSTANG GT
9904 MUSTANG GT AMT
About the manufacturer
For the person who is looking for a complete Flowmaster® cat-back dual exhaust system with an aggressive tone. With easy fit in mind, this American Thunder® exhaust system features mandrel-bent 2.50-inch aluminized steel tubing for maximum performance and includes a pair of specially selected Super 40® Series performance mufflers for a deep powerful sound. The custom tailpipes feature added clearance and exit in the factory location with large 3.00-inch polished tips. The system uses the factory hanger locations for an easy install and delivers a moderate to aggressive interior and exterior tone, best suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage and are designed for an easy fit. The system includes all necessary parts, hardware and instructions for an easy installation you can do at home. Covered by our 3-year Limited Warranty. If you prefer a full stainless steel system covered by our Lifetime Limited Warranty, check out our cat-back exhaust system #817312.
Additional manufacturer information
SYS 99-04 MU
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