My CLutch seems to be slipping, but only when revving really high. All other occassions it bites properly. I thought it was the slave cylinder. Replaced it with the original BMW part and it's still the same. It only really happens in 1st and 2nd gears, at high revs. There is no burnt clutch smell coming from the engine compartment. It takes a couple of seconds to disengage after releasing the clutch pedal. Any ideas?

AK