BMC Crank case ventilation filter, Connection 16mm, Length 47mm PERFORMANCE 900 (94-98) Fits: 9000 (88-94) CD 4-Door

Fits: 9000 (88-94) CD 4-Door / 9000 (91-92) 5-Door Hatchback

it achieves the best possible cooling efficiency combined with lowest possible pressure drop

If your intake system don't have the performance you need it will be to tough for the turbocharger to get the air it needs which will lower engine efficiency and this will make you loose hp

Reference: 5Q0145838

From Gearbox # 94CW60809-

BMC Crank case ventilation filter, Connection 16mm, Length 47mm PERFORMANCE 900 (94-98) Fits: 9000 (88-94) CD 4-DoorBMC Crank case ventilation filter The crank case ventilation is a crucial aspect in having a healthy and well functioning engine. The airflow must be sufficient or the filter may clog up, which may cause sever damage to the engine! Meanwhile the filtration must be good enough to prevent impurities and dirt from entering the engine. A good crank case filter is a must choose BMC! How to choose your filter: 1. Dimensions for this air filter is according