I'm in the process of fitting SEM (OMEX) to a Digi. Just sorting out the airbox at the moment, using a GTD top half. Anyway, my question, oh wise CGTI gurus, is ; do I need the vac line to the airbox? Or is that only for the cold running flap in the 'box that aids running when the car is cold? Because that's getting deleted anyway. The ECU doesn't need a vac reference.