Cummins ISB, QSB 4.5L, QSB 6.7L SCR Outlet Catalyst Module 2013-2016: OEM 4353066

Consistent SCR Treatment for Cummins ISB and QSB Diesel Engines

What is it?
The Cummins ISB, QSB 4.5L, QSB 6.7L SCR Outlet Catalyst Module, identified by OEM 4353066, is an exhaust aftertreatment component designed for compatible diesel engines produced between 2013 and 2016. It works within the Selective Catalytic Reduction (SCR) system to help convert nitrogen oxides (NOx) in the exhaust into less harmful substances. Proper catalyst function helps maintain effective exhaust treatment and reliable emissions system operation.

Why choose this SCR Outlet Catalyst Module?
The SCR catalyst plays an important role in processing NOx emissions as exhaust gases pass through the aftertreatment system. Repeated exposure to high exhaust temperatures, contamination, excessive soot, physical damage, or catalyst deterioration can reduce its effectiveness over time. A compromised catalyst may contribute to emissions-related fault codes, warning lights, reduced SCR efficiency, or engine derate conditions. Using the correct OEM-matched replacement helps maintain compatibility with the existing Cummins aftertreatment system.

Key Benefits
✅ Designed for compatible Cummins ISB, QSB 4.5L, and QSB 6.7L engines (2013–2016)
✅ Helps reduce NOx through the SCR emissions process
✅ Supports effective diesel exhaust treatment
✅ Promotes consistent aftertreatment system operation
✅ OEM-matched replacement for proper fitment

Applications
This SCR Outlet Catalyst Module is intended for compatible Cummins ISB, QSB 4.5L, and QSB 6.7L diesel engine applications manufactured between 2013 and 2016. These engines are used in a range of commercial and industrial equipment where dependable emissions treatment is important for daily operation. Verify OEM 4353066 against the original catalyst module and specific engine configuration before ordering.

Installation Notes
Before installation, inspect the surrounding exhaust piping, sensors, DEF dosing components, clamps, seals, and mounting hardware for leaks, contamination, or damage. Diagnose any underlying engine, DEF dosing, or aftertreatment problems that may have contributed to the previous catalyst issue. Follow the appropriate Cummins service procedures and ensure all exhaust connections are properly aligned and secured. After installation, check for exhaust leaks and verify correct SCR system operation.

Final Thoughts
Reliable SCR treatment helps maintain proper emissions control across Cummins ISB and QSB diesel applications. The Cummins ISB, QSB 4.5L, QSB 6.7L SCR Outlet Catalyst Module (OEM 4353066) provides an OEM-matched replacement for compatible 2013–2016 applications, helping support effective NOx treatment and dependable aftertreatment operation.