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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.
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.
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.
Other popular Flowmaster products customers consider together:
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.
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.
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.
Other popular Flowmaster products customers consider together: