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Let your Suzuki Hayabusa breathe like the stallion it is. Gen 1 (99-07) busas have a large restrictive "flapper" in the airbox than reduces airflow. The "airbox mod" involves cutting this out to allow more airflow into the engine. Luckily the Gen 2 (08-15) Hayabusa does not have this restriction. But there is still power to gain with a set of velocity stacks and good performing air filter.

If you really want the wow factor, check out the oversized ram air scoops and carbon fiber airbox.