Cummins ISL, 8.9L, ISB 6.7L Aftertreatment Device 2014-2018: OEM 4329235

Complete Emissions Module for Cummins ISL & ISB Engines (2014–2018)

What is it?
The Cummins ISL 8.9L / ISB 6.7L Aftertreatment Device (OEM 4329235) is a fully integrated exhaust aftertreatment assembly designed for Cummins engines manufactured between 2014 and 2018. This unit combines multiple emissions control components into one system to treat exhaust gases before they exit the vehicle.

Why choose this Aftertreatment Device?
Built to Cummins OEM specifications, this aftertreatment device is engineered for seamless compatibility with factory exhaust systems. It processes exhaust gases through a combination of filtration and catalytic technologies to reduce harmful emissions and support compliance with environmental standards.

Over time, aftertreatment assemblies can become restricted or less efficient due to soot buildup or internal wear, which may lead to regeneration issues or emissions-related fault codes. Replacing the unit with the correct OEM component helps restore proper exhaust flow and system performance.

Key Benefits
✅ Designed for Cummins ISL 8.9L & ISB 6.7L engines (2014–2018)
✅ Integrated system combining multiple aftertreatment functions
✅ Helps reduce harmful exhaust emissions
✅ Supports proper exhaust flow and regeneration performance
✅ Direct replacement — no modifications required

Applications
This aftertreatment device is commonly used in medium- and heavy-duty commercial vehicles powered by Cummins ISL and ISB engines. Typical applications include regional trucks, vocational vehicles, fleet units, and industrial equipment where emissions compliance and reliable operation are essential.

Installation Notes
Before servicing, allow the exhaust and aftertreatment system to fully cool. Remove the existing assembly and inspect surrounding components such as sensors, DEF lines, and mounting hardware for damage or contamination. Install the replacement unit using proper clamps, gaskets, and fasteners to ensure a secure fit. After installation, reset the aftertreatment system if required and verify proper operation using diagnostic tools.

Final Thoughts
If your Cummins-powered vehicle is experiencing emissions alerts, poor regeneration performance, or restricted exhaust flow, replacing the aftertreatment device with the correct OEM unit can help restore full system functionality. The Cummins Aftertreatment Device (OEM 4329235) plays a critical role in maintaining efficient emissions control and dependable engine performance.