The Selective Catalytic Reduction (SCR) filter plays a critical role in controlling emissions on Cummins QSB4.5 and 3.8 engines from 2018 to 2024. Working as part of the SCR system, this filter helps reduce nitrogen oxides (NOx) in the exhaust, contributing to cleaner emissions and helping your engine maintain regulatory compliance. Over time, SCR filters can become worn or restricted, leading to reduced emissions performance and potential fault codes. The Cummins QSB4.5, 3.8 SCR Filter OEM 5505816 from Tamerx Diesel Parts is engineered to meet original equipment specifications, providing a reliable replacement to keep your emissions system operating as intended.
• Effectively reduces NOx emissions by enabling the SCR system to convert nitrogen oxides into harmless
nitrogen and water vapor, supporting cleaner exhaust output and environmental compliance
• Designed for Cummins QSB4.5 & 3.8 engines (2018–2024) ensuring correct fitment, smooth installation,
and dependable integration with the factory exhaust and aftertreatment system
• Supports stable exhaust flow by maintaining proper gas movement through the SCR system, helping
downstream components work efficiently without restriction
• OEM-grade construction (5505816) offering dependable durability, consistent performance, and
compatibility with original SCR hardware
• Ideal for highway and light-to-heavy duty applications where sustained emissions control and efficient
SCR operation are essential for long-term reliability
Replacing a worn or failing SCR filter with the Cummins QSB4.5, 3.8 SCR Filter OEM 5505816 from Tamerx Diesel Parts helps restore proper emissions treatment and supports long-term exhaust system health. Investing in a high-quality, OEM-matched SCR filter ensures your engine maintains efficient emissions performance and continues operating reliably across diverse driving conditions.







































