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DNA replacement air filters are designed to increase the horsepower and acceleration of motorbikes and to ensure optimum filtration. The filter is easy to clean, reusable and designed to fit into the original air filter box. Furthermore, these filters offer a higher airflow with a filter efficiency of up to 99%. The accessories in the Stage 2 Filter Kit, can include either a filter or a DNA air filter box cover, replacing part of the air filter box but also progressively increasing airflow to the engine. By calibrating the fuel supply accordingly, impressive results are achieved.