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Hi,
FYI, there is no EGR (Exhaust Gas Recirculating) valve on the Boxster. Very dated technology that. It was used to re-route exhaust gasses back through the engine until the Catalytic Converter(s) would heat up to operating temperature. The Boxster uses a Secondary Air Pump to add additional oxygen to the exhaust stream for more complete combustion and to heat up the cats...
Happy Motoring!... Jim'99
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