Dieselr Aluminized DPF Race Pipes | 2500/3500 6.6L GM DURAMAX LMM (2007.5-2010)The Dieselr Aluminized DPF Race Pipes (2007. 52010 6. 6L GM Duramax LMM) are built for Chevy Silverado and GMC Sierra 2500 3500 HD owners who demand stronger flow, easier fitment, and long term reliability. Constructed from heavy duty aluminized steel, these pipes improve exhaust velocity and reduce restriction for more efficient operation under load. Each Dieselr race pipe is mandrel bent for smooth, unrestricted flow and precision welded for