The part numbered 04-31354-004 stands as a header meticulously engineered for integration within the SSI (Selective Catalytic Reduction System) of vehicles equipped with Cummins engines. Characterized by a 6-bolt design, the header boasts a connector that secures connections within the exhaust system, assuring an impermeable and dependable linkage. Functionally, the SSI acts as an emission control mechanism, harnessing a urea-based solution (DEF) to curtail pollutants within exhaust fumes. The header plays a pivotal role in directing the fluid and passage of exhaust gases within the system.