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The interaction between the airbox, air filter and engine is a finely tuned construct. A new airbox requires precise retuning of the other components and the engine. But it's worth it! The racing airbox not only provides more power in the upper rev range, but also ensures a more even power delivery in the mid rev range. Combined with the intake air routing for superbikes, not only does the engine run more efficiently, but acceleration also gets a noticeable boost.