Intake efficiency is increased by expanding the bore diameter and butterfly diameter. The new butterfly allows for tuning that also serves as a refresh. In order to improve quality, the body part has been blasted.

It's time for AP1.5 & AP2 to refresh its throttle body, too. Intake efficiency is increased by expanding the bore diameter and butterfly diameter. The butterfly has been newly adjusted (from Φ64 to Φ66), allowing for tuning that also serves as a refresh.