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I believe they feed oxygen(fresh air) into the exhaust system to help the cats warm up faster. The car does its worst polluting before the converters begin to function. The air system only operates for the first few minutes when the engine is cold. IMHO, you could take it off, but unless your last name is Schumacher, you're not going to notice. The air pump is a small plastic thing that doesnt weigh very much....I'd unblock em and tune them back in.