A similar optimization as the EXUP is used on the intake side, where a valve system regulates the air intake diameter of the airbox just before the air filter.

• 类似的优化作为EXUP上使用量方面，如果系统调节阀的进气口直径airbox前的空气过滤器。This keeps the airflow and air intake speed always at an optimum level； for the best throttle response.；这样可以使空气流通，进气的速度总是在最佳水平，最好的油门反应。