Actually its been a long time since I worked on them but the Baro solenoid is in the MAP vacum line and the Wastegate solenoid is the one in the wastegate line. It lets the controller be able to raise or lower boost some by controlling the vent in the wastegate line. The Baro just turns off the vacum to the MAP every so often and vents the MAP to atmosphere so it can take a baro reading. I do remember the hard brittle lines that would crack all over when you had to pull the head on one. Ron