Modern diesel engines depend on a well-functioning exhaust aftertreatment system to reduce harmful emissions and support consistent operation. A critical part of that system is the Selective Catalytic Reduction (SCR) assembly, which helps treat nitrogen oxides (NOx) before they are released into the atmosphere. The Cummins B6.7, L9 SCR 2018–2021: OEM 5418680 is engineered as a direct-fit replacement designed to restore proper emissions reduction and keep your engine running cleanly and reliably.
• The SCR assembly converts nitrogen oxide (NOx) gases into harmless nitrogen and water,
helping meet EPA emissions requirements and reduce environmental impact without compromising performance.
• The OEM 5418680 SCR unit is built specifically for Cummins B6.7 and L9 engines from 2018 through 2021,
ensuring precise fitment and compatibility with your vehicle’s original aftertreatment configuration.
• Working alongside the DEF dosing components, this SCR assembly supports balanced exhaust treatment,
helping optimize DEF usage and maintain consistent NOx control across various driving conditions.
• Installing the correct OEM SCR replacement helps reduce the likelihood of warning lights, fault codes,
and derate events that can disrupt operation and lead to costly diagnostics.
• A properly functioning SCR system helps protect other aftertreatment components by minimizing excessive emissions buildup,
which supports longer service life and fewer unscheduled repairs.
• Choosing an OEM-specified part like the Cummins B6.7, L9 SCR 2018–2021: OEM 5418680 delivers confidence in durability,
correct integration, and dependable emissions control performance tailored to your engine’s design.
Selecting the right SCR assembly is an important step in maintaining your Cummins B6.7 or L9 engine’s exhaust aftertreatment system. The OEM 5418680 SCR unit provides the proper fit and reliable operation needed to support effective emissions reduction, helping your truck stay compliant and perform efficiently. At Tamerx Diesel Parts, we offer quality diesel components to help keep your vehicle road-ready and dependable mile after mile.





























