Roger Clark Motorsport 4 Stage Dry Sump System w/Turbo ScavengeNote: Dry Sump Tank and Hoses Fittings not included and available separately. A key concern with any Subaru EJ engine, which has been tuned for performance or race use, is that of a reliable oil supply. A Dry Sump System can offer levels of safety and reliability which cannot be achieved when utilsing a standard or even baffled wet sump configuration. The RCM system completely scavenges the crankcase, which dramatically reduces the residual oil left