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Ships within 48 hours · Estimated delivery Jul 31 - Aug 5
Available with both a washable oiled (cleanable) filter and a dry extendable filter
This conversion kit allows you to replace the failure-prone CP4 with the proven and reliable CP3 pump setup — the same style pump trusted in earlier Duramax platforms and high-performance builds
Stainless steel manifold studs
Long-term cost savings over disposable filters
2003-2026 CUMMINS AIRAID SYNTHAFLOW OILED REPLACEMENT AIR FILTER (850-357) Graphic Tee Available with both a washableUpgrade your factory air filter with the Airaid SynthaFlow Oiled Replacement Air Filter, designed to improve airflow, increase engine efficiency, and provide long lasting reusable performance for your Cummins. This drop in replacement installs directly into the factory airbox and offers better airflow than restrictive stock paper filters while maintaining excellent filtration. The SynthaFlow filter uses multiple layers of oiled cotton and synthetic
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