3 port boost solenoid
 

Why is the 3 port better than the 2 port
Just wanting to understand the workings of the boost pack
Im using a stand alone boost controller and ive 2 spare 3 port solenoids kicking around

from what i know they can control boost more efficiently and can hold peak boost for a longer period of time, they also give more control to the mapper when setting the cars boost levels up etc