I see no porpose for a blow off valve on the intake side. Now did someone tell you this, or did you see with your own eyes there was a blow off valve on the intake side ( it wasn't misenterpreted for an intercooler pipe?) The reason I ask is because the porpose of a BOV as you know, is to vent boost on closed throttle. The diaphragm of the BOV is acted upon by suction when the throttle is open, and when closed, the excess boost pushes it open in order to vent, so I see no reason why one of these would be applied to the intake side of an engine. It will remain closed when the car is sucking in air, but even when you let off the throttle, it's not venting anything due to the fact there is no excess pressure.
The reason cars run 2 blow off valves is for high boost setups where one BOV may not vent all excess boost when the throttle plate is closed, consider it a precation sometimes. Some cars run rediculous boost ( usually around 30 lbs or more) and most BOV's aren't adequate at those levels, or are reaching their limits.
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