Flowmaster American Thunder Cat-Back Exhaust System — Fits 2001-2006 GM 2500/3500 HD

SKU: BDXN_17328
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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

About Flowmaster

Flowmaster engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Flowmaster lineup with fast shipping and expert fitment support — order with confidence.

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Flowmaster American Thunder Cat-Back Exhaust System for 2001-2006 GM 2500/3500 HD Trucks

Elevate the performance and sound of your 2001-2006 GM 2500 or 3500 Heavy Duty truck with the Flowmaster American Thunder Cat-Back Exhaust System. This system is meticulously engineered to deliver an aggressive, deep exhaust note and noticeable performance gains, all while providing a straightforward installation.

System Highlights:

  • Type: Cat-Back Exhaust System
  • Diameter: 3 inches
  • Exit Configuration: Single Side Exit
  • Tip Size: 4-inch Polished Tips
  • Construction: Made from durable steel with an aluminized coating for superior corrosion resistance.
  • Vehicle Fitment: Designed for 2001, 2002, 2003, 2004, 2005, 2006 GM 2500 and 3500 HD trucks.

The Flowmaster American Thunder series is the go-to choice for truck owners seeking a powerful sound and enhanced driving experience. This cat-back system replaces the factory exhaust from the catalytic converter back, optimizing exhaust gas scavenging for improved throttle response, horsepower, and torque. The single side exit with large polished tips provides a clean, aggressive look.

Constructed from aluminized steel, this exhaust system is built to withstand the rigors of daily driving and demanding work conditions. The aggressive tone is unmistakable, making your HD truck sound as powerful as it looks and performs. This kit includes all the necessary hardware for a complete bolt-on installation.

For robust exhaust upgrades, choose Flowmaster and GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Flowmaster

Flowmaster engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Flowmaster lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Flowmaster American Thunder Cat-Back Exhaust System for 2001-2006 GM 2500/3500 HD Trucks

Elevate the performance and sound of your 2001-2006 GM 2500 or 3500 Heavy Duty truck with the Flowmaster American Thunder Cat-Back Exhaust System. This system is meticulously engineered to deliver an aggressive, deep exhaust note and noticeable performance gains, all while providing a straightforward installation.

System Highlights:

  • Type: Cat-Back Exhaust System
  • Diameter: 3 inches
  • Exit Configuration: Single Side Exit
  • Tip Size: 4-inch Polished Tips
  • Construction: Made from durable steel with an aluminized coating for superior corrosion resistance.
  • Vehicle Fitment: Designed for 2001, 2002, 2003, 2004, 2005, 2006 GM 2500 and 3500 HD trucks.

The Flowmaster American Thunder series is the go-to choice for truck owners seeking a powerful sound and enhanced driving experience. This cat-back system replaces the factory exhaust from the catalytic converter back, optimizing exhaust gas scavenging for improved throttle response, horsepower, and torque. The single side exit with large polished tips provides a clean, aggressive look.

Constructed from aluminized steel, this exhaust system is built to withstand the rigors of daily driving and demanding work conditions. The aggressive tone is unmistakable, making your HD truck sound as powerful as it looks and performs. This kit includes all the necessary hardware for a complete bolt-on installation.

For robust exhaust upgrades, choose Flowmaster and GGCRACING.

Product Details

Product Description

About Flowmaster

Flowmaster engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Flowmaster lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Flowmaster American Thunder Cat-Back Exhaust System for 2001-2006 GM 2500/3500 HD Trucks

Elevate the performance and sound of your 2001-2006 GM 2500 or 3500 Heavy Duty truck with the Flowmaster American Thunder Cat-Back Exhaust System. This system is meticulously engineered to deliver an aggressive, deep exhaust note and noticeable performance gains, all while providing a straightforward installation.

System Highlights:

  • Type: Cat-Back Exhaust System
  • Diameter: 3 inches
  • Exit Configuration: Single Side Exit
  • Tip Size: 4-inch Polished Tips
  • Construction: Made from durable steel with an aluminized coating for superior corrosion resistance.
  • Vehicle Fitment: Designed for 2001, 2002, 2003, 2004, 2005, 2006 GM 2500 and 3500 HD trucks.

The Flowmaster American Thunder series is the go-to choice for truck owners seeking a powerful sound and enhanced driving experience. This cat-back system replaces the factory exhaust from the catalytic converter back, optimizing exhaust gas scavenging for improved throttle response, horsepower, and torque. The single side exit with large polished tips provides a clean, aggressive look.

Constructed from aluminized steel, this exhaust system is built to withstand the rigors of daily driving and demanding work conditions. The aggressive tone is unmistakable, making your HD truck sound as powerful as it looks and performs. This kit includes all the necessary hardware for a complete bolt-on installation.

For robust exhaust upgrades, choose Flowmaster and GGCRACING.

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