Roger Clark Motorsport 12mm Modified Oil PumpRCM 12mm Modified Oil Pump At the heart of all Roger Clark Motorsport engines is the now world renowned RCMS Modified oil pump. This clever, effective modification has been designed to assist the Impreza with its oil supply and is now regarded as a must have modification with any Impreza engine build. Each pump is carefully checked, given a serial number and then modified to incorporate a different pressure relief valve ensuring greater reliability
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