Quote:
Originally Posted by Habernash
The clutch delay valve restricts brake fluid by action of the slave/master cylinder. This will slip the clutch a bit to allow marginal manual drivers to not stall out so easily from a start. It is only on non M platform cars. As stated above the M series cars do not use it, because the presumption is those driving an M would also know how to drive a manual correctly 
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E8[5|6]M has one, and it was ugly.