Porsche Indoor Car Cover Sport Turismo 9J1073023 9J1073023 91151233101 Features and Benefits:Reduces the oil Select Body Style:Narrow Body Features and Benefits:Reduces the oil blow by from the crank ventilationKeeps the oil in the engine while still allowing good crank ventilationVery simple mounting sandwiches between the crankcase and ventilation the lid breather coverUsed on all Hastech race & street enginesRecommended for all aircooled Porsche 911 engines to help reduce oil consumption caused by ingestion of oil laden air into the intake caused by excess crankcase windage and blow by Sound power level: 108 Porsche Indoor Car Cover Sport Turismo