Dieselr Aluminized 4" Cat & DPF Race Pipes | GM 2500/3500 6.6L DURAMAX LML 2011-2015The Dieselr Aluminized 4" Cat & DPF Race Pipes (20112015) are engineered for serious diesel applications demanding reliability, flow efficiency, and long term strength. Constructed from heavy gauge aluminized steel, these pipes deliver clean airflow, reduced restriction, and dependable corrosion protection. Every Dieselr race pipe is mandrel bent for consistent exhaust velocity and precision welded for a leak free finish. The aluminized surface
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