Dieselr Aluminized 4" Cat & DPF Race Pipes | GM 2500/3500 6.6L DURAMAX L5P 2017-2023The Dieselr Aluminized 4" Cat & DPF Race Pipes (20172023) are built for performance focused diesel owners who expect uncompromising durability and flow efficiency. Manufactured from 4 inch heavy gauge aluminized steel, these pipes deliver a clean, unrestricted exhaust path that improves airflow and consistency under demanding load conditions. Each Dieselr race pipe is mandrel bent for precision flow and TIG welded for long term integrity. The