A mostly useful DIY on deleting your clutch delay valve, and my first impressions with a description of the difference it makes. For more details take a look here: http://www.impee.co.uk/bmw_cdv_delete.htm Impee's DIY is excellent. Disclaimer: I am not a mechanic, just a dude who likes messing around with cars. If you are concerned about your own wrenching skills, seek a certified mechanic to do modifications to your car.