The Sinister Diesel Universal Replacement Air Filter is designed to replace a damaged filter on a Sinister Diesel Cold Air Intake or support a custom air intake project. With a 4-inch inner diameter and 10-inch overall height, this high-flow filter provides the airflow capacity needed for demanding automotive applications while offering universal fitment for compatible intake systems. Part number SD-CAI-FILTER is an ideal choice for drivers, builders, and enthusiasts seeking a reusable performance air filter.
Constructed with 8-layer cleanable cotton filter media, the Sinister Diesel SD-CAI-FILTER balances high airflow with long-term usability. The reusable design allows the filter to be cleaned and maintained instead of routinely replaced, helping support consistent intake performance over time. A honeycomb filter guard finished in Sinister Blue adds protective support to the filter media and gives the component a distinctive appearance when installed in an exposed or aftermarket intake system.
This Sinister Diesel replacement filter is intended for automotive use and includes a silicone inlet compatible with a 4-inch intake connection. It is not CARB approved and may require acknowledgment of applicable emissions restrictions before purchase or installation. Verify intake clearance, connection compatibility, and local emissions requirements before ordering. A compatible pre-filter is also available separately for additional protection in dusty or off-road environments.
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