99-05 GM P/U Ext Cab SB American Thunder System

The Flowmaster 99-05 GM P/U Ext Cab SB American Thunder System is a cat-back dual exhaust upgrade designed specifically for 1999–2005 GM fullsize pickup trucks with extended cabs and short beds. This system enhances exhaust flow and delivers an aggressive tone while ensuring durability for everyday use.

Constructed from aluminized steel, this exhaust system is engineered to resist corrosion and withstand harsh conditions, making it a reliable choice for truck owners. The dual 3-inch diameter piping is designed for optimal scavenging efficiency, providing a significant performance boost over restrictive OEM systems without the need for additional modifications.

Truck owners looking for improved performance and sound will benefit from this system, which features a side exit configuration that minimizes cabin drone and directs exhaust heat away from cargo areas. The kit includes all necessary hangers, clamps, and hardware for a straightforward installation on extended-cab models, ensuring compatibility and ease of use.