I drive a 2001 330ci and have noticed that if I try to drop the clutch to fast i get a fair amount of slippage. I recently found a "unlock valve" part on bavauto.com that claims BMW has a factory installed lock valve limiting the flow of hydraulic fluid through the clutch causing the slippage. This part claims to eliminate that problem. Has any one else heard about this or installed on of these parts? Does anyone have any positive or negative experience with a similar part?