Cummins QSB 6.7L SCR Filter 2011-2018: OEM 4328917

Reliable SCR 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 4328917, is an emissions aftertreatment component designed specifically for Cummins QSB 6.7-liter diesel engines manufactured between 2011 and 2018. Installed as part of the Selective Catalytic Reduction (SCR) system, this filter plays a role in conditioning exhaust gases so they’re better suited for NOx reduction when Diesel Exhaust Fluid (DEF) is applied downstream.

Why choose this SCR Filter?
This SCR filter is built to Cummins’ original specifications for the QSB 6.7L platform, ensuring a correct fit and dependable interaction with DEF injectors, emissions sensors, and control systems. Over time, soot, ash, and other combustion byproducts can accumulate in the filter and reduce its ability to condition exhaust flow effectively. Replacing with the correct OEM-specified SCR filter helps maintain smoother exhaust conditioning and supports consistent NOx reduction across the aftertreatment system.

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

Applications
This SCR filter is ideal for medium- and heavy-duty trucks and commercial vehicles equipped with Cummins QSB 6.7L engines manufactured between 2011 and 2018. Typical applications include regional transport rigs, vocational trucks, delivery vehicles, and other platforms where consistent emissions performance and regulated exhaust conditioning are important.

Installation Notes
Before servicing, ensure the exhaust and aftertreatment system has fully cooled. Remove the existing SCR filter and inspect surrounding DEF lines, sensor connections, and mounting hardware for soot buildup, wear, or damage. Install the replacement filter using appropriate seals and clamps to ensure a secure, leak-free fit. Once installed, clear any stored system codes and verify correct SCR behavior using diagnostic tools.

Final Thoughts
If your Cummins QSB 6.7L-equipped vehicle is showing NOx-related indicators, inconsistent emissions readings, or irregular aftertreatment behavior, replacing the SCR filter with the correct OEM-specified part can help restore steadier exhaust conditioning and smoother SCR operation. The Cummins QSB 6.7L SCR Filter (OEM 4328917) plays a key role in managing regulated exhaust chemistry and supporting dependable engine performance across varied duty cycles.