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The K&N foam insert block (E-0644) is an optional replacement piece that fits DSL model applications only. It directly replaces the OEM foam block and ships pre-cut and ready to install, simplifying service and ensuring a correct fit. Use it when an OEM-style foam element is required for diesel intake assemblies, offering an easy, drop-in maintenance option.
K&N Air Filter Foam Insert Block DSL Only (E-0644)
