Cummins QSB 6.7L SCR Filter 2011-2018: OEM 4328919

Smooth NOx Conditioning for Cummins QSB 6.7L Engines (2011–2018)

What is it?
The Cummins QSB 6.7L SCR Filter (2011–2018), identified by OEM part number 4328919, is an emissions aftertreatment component designed for Cummins QSB 6.7-liter diesel engines manufactured between 2011 and 2018. Installed ahead of the Selective Catalytic Reduction (SCR) catalyst, this filter helps condition exhaust gases so that nitrogen oxides (NOx) are properly prepared for reduction when interacting with Diesel Exhaust Fluid (DEF).

Why choose this SCR Filter?
This SCR filter is engineered to Cummins’ original specifications for the QSB 6.7L platform, ensuring accurate fitment and dependable interaction with DEF delivery components, emissions sensors, and control systems. Over time, soot, ash, and other exhaust deposits can diminish a filter’s effectiveness, which can make gas conditioning less consistent and potentially trigger emissions warnings or higher backpressure. Choosing the correct OEM-specified filter helps maintain balanced exhaust behavior and supports coordinated SCR performance.

Key Benefits
✅ Designed for Cummins QSB 6.7L aftertreatment systems (2011–2018)
✅ Helps prep exhaust gases for effective NOx reduction
✅ Encourages stable interaction with DEF dosing and emissions sensors
✅ Direct replacement — no modifications required
✅ Built for heavy-duty use and extended service life

Applications
This SCR filter is suitable for medium- and heavy-duty vehicles equipped with Cummins QSB 6.7L engines manufactured from 2011 through 2018. It’s commonly found in long-haul trucks, regional transport rigs, vocational equipment, and other work platforms where emissions performance and regulated exhaust conditioning are essential.

Installation Notes
Before service, make sure the exhaust and aftertreatment system has fully cooled. Remove the existing SCR filter and inspect adjacent DEF lines, sensor connections, and mounting points for signs of soot buildup, wear, or damage. Install the replacement filter using proper gaskets and clamps to secure a tight, leak-free fit. After installation, clear any stored system codes and verify correct SCR system behavior with diagnostic tools.

Final Thoughts
If your Cummins QSB 6.7L-equipped vehicle is showing NOx-related alerts, uneven emissions readings, or inconsistent aftertreatment performance, installing the correct SCR filter can help restore steadier exhaust conditioning and smoother emissions behavior. The Cummins QSB 6.7L SCR Filter (OEM 4328919) plays an important role in managing regulated exhaust chemistry and supporting dependable engine operation across varied duty cycles.