haitech

i need to know if i can use a greddy spec 1 solenoid for a spec 2... and i want to know if i can use a IAB or EVAP purge solenoid as a replacement.. and can someone tell me exactly what is happening when a boost controller is used... like the voltage signal that is either sent or taken away from the solenoid. and where does the vacuum go or sent to. thank you very much