Nice work krum! I was gonna do that but I got lucky n pulled an aluminum manifold off a 94 c220. I'm gettin rid of the vdo bypass completely but I meant the secondary air series of check valves that plumb into the supercharger. I see a vac line goin to a sensor so I figure if I plumb it into my ic piping it should see a similar value as when the sc is engaged at cold start. Theories are great...in theory