Flowmaster 99-04 Mustang GT 4.6L American Thunder SS Cat-Back Exhaust System (817312)

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SKU: FLO817312
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Sale price$1,049.95 Regular price$1,181.95
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

Flowmaster 99-04 Mustang GT 4.6L American Thunder SS Cat-Back Exhaust System

Flowmaster American Thunder Cat-back Exhaust System

1999-2004 Ford Mustang GT, MACH1 and Bullitt with 4.6L SOHC engine, Stainless Steel - Aggressive to moderate sound

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 stainless steel tubing for maximum performance and includes a pair of specially selected Super 40® Series performance mufflers. 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.

  • Brand: Flowmaster
  • Part number: 817312
  • Category: Exhaust, Mufflers & Tips
  • Type: Catback

Product Details

Product Description
Part Numbers
Sizing & Fit

Flowmaster 99-04 Mustang GT 4.6L American Thunder SS Cat-Back Exhaust System

Flowmaster American Thunder Cat-back Exhaust System

1999-2004 Ford Mustang GT, MACH1 and Bullitt with 4.6L SOHC engine, Stainless Steel - Aggressive to moderate sound

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 stainless steel tubing for maximum performance and includes a pair of specially selected Super 40® Series performance mufflers. 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.

  • Brand: Flowmaster
  • Part number: 817312
  • Category: Exhaust, Mufflers & Tips
  • Type: Catback

Product Details

Product Description

Flowmaster 99-04 Mustang GT 4.6L American Thunder SS Cat-Back Exhaust System

Flowmaster American Thunder Cat-back Exhaust System

1999-2004 Ford Mustang GT, MACH1 and Bullitt with 4.6L SOHC engine, Stainless Steel - Aggressive to moderate sound

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 stainless steel tubing for maximum performance and includes a pair of specially selected Super 40® Series performance mufflers. 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.

  • Brand: Flowmaster
  • Part number: 817312
  • Category: Exhaust, Mufflers & Tips
  • Type: Catback

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