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Hey, I just got a 2006 Focus ST 3 days ago, and I'm ready to add some power to it, so far I'v looked at CAI (marcy, and focusport, and K&N) but that's all I'v really seen as far as performance upgrades. Help me out.
In other words it's a special material that goes over the outside of the filter that keeps water out and still lets air in. This keeps any spray and splash from the oiled cotton filter media.Algorhythm said:It is a hydrophobic wrap for the K&N filter.