Just to keep people from being misinformed .
I think Boost will not bypass the core. The circle around your bypass hole in the blower will seal against the intercooler plate and seal any air from entering through here under boost. ZZP removes the H bar and does not use a bypass hole in their intercooler because they say it allows the use of a longer core and lets the boost pressure flow over more of the core area. I can tell you 90% of the heat is concentrated in the front half of the core so I really think its not needed. This design is just fine and that part of the core sticking into the bypass hole will not hurt a thing.
The bypass valve is closed only when you do not have vacuum. This greatly depends on throttle position and engine speed. If your at wot you have NO vacuum and thats what lets the bypass valve close. There is a spring inside the valve that closes it by default. When you idle or are at light throttle, driving down the hiway ect, manifold vacuum holds the valve open. Its open while cruising, Idling, or anytime there is manifold vacuum. When you open the throttle and lose vacuum it closes to keep boost pressure in the LIM where it belongs.
