The stock K20 oil pump is a great piece for up to 9,000 rpm bursts. Sustained 9k and Beyond 9,000 the stock oil pump starts to cavitate. Continuous duty at high rpm and in endurance/road racing with very high oil temperature, this cavitation can be catastrophic. this ported pump will allow continuous use at and above 9,000 rpm, this will run the pump beyond 11,000 rpm with great success. We start with a brand new OEM oil pump from Honda, disassemble, remove any factory sharp edges, casting marks ect, port and polish, The pump is then cleaned, hot tanked, assembly lubed and reassembled.