on my greddy profec b spec 2, the solenoid has 3 ports, you alter the way the pipes attach, for if you have ex wastegate or actuator, if you have your set up ie: external, you run the pipes parralell and the center one vent to atmosphere, top of the actuator goes to (com) on the selonoid which is the one thats on the side and runs parralell to the other, the other one that runs parralell goes to a pressure source ie: the comp housing on the tubby, you also t into this one and connect it to the bottom opening on the wastegate,then the front of the solenoid vent to atmosphere.
