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Edit: I just remembered that the CA cars don't have an overboost valve! The valve on the side of the turbo (ARV) releases boost pressure. If it was my car, I would remove every vac line and hose except the hose for the trans and VCV. Everything else is for CA emissions, and is not needed. You asked about the switch on top of the valve cover, that is the compressor cut-out switch (de-clutches the A/C compressor at WOT for a BURST of power!).
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