HONDATA 4-PORT BOOST CONTROL SOLENOIDHONDATA 4 port Boost Solenoid. Available for the Hondata s300, Hondata K Pro and K100, the normally closed boost control solenoid is designed for use in high boost applications, but also works well in low boost applications. It is normally closed so that if there is a failure you will run off the waste gate spring instead of over boosting. It uses 1 8th NPT fittings which allow you to use NPT to AN fittings if you wish. This is the newer 4 port