i know subaru turbo engines has the purge solenoid valve that goes to the canister.. but not sure what the twin turbo subaru will have it or not.. i know it has the vacuum tank , is that the charcoal canister or is there not a charcoal canister on this engine.. i have a subaru jdm ej20 twin turbo 1994 . can't seem to find the purge solenoid valve.. theres nothing screwed in the intake manifold or under it no wheres.. is there a vacuum type instead of solenoid type on this engine??