99-06 GM P/U Ext Cab SB American Thunder System

The 99-06 GM P/U Ext Cab SB American Thunder System is a cat-back exhaust solution designed for 1999–2007 GM fullsize extended-cab pickup trucks with short beds. This system is ideal for truck owners looking to enhance performance and achieve a more aggressive exhaust note. It replaces the factory piping and muffler assembly to unlock horsepower and improve throttle response.

Constructed from aluminized steel, this exhaust system is built to resist rust and corrosion, making it suitable for harsh climates. The 3-inch diameter mandrel-bent tube design ensures optimal exhaust flow while minimizing turbulence. The dual rear exit configuration with polished tips enhances both performance and aesthetics.

Extended-cab and short-bed GM truck owners, especially those with LS engines, will appreciate the noticeable improvements in throttle response and sound. This system maintains emissions compliance by retaining the catalytic converter while providing a significant upgrade over the factory exhaust.