I haven't done the VANOS seals on my M50 but I did do them on my 130K M54B25 as I also perceived a lack of torque low down. The old seals were very brittle and flattened but the new ones didn't make a blind bit of difference as far as can tell, either on performance or economy. I've come to the conclusion that the BMW straight six is just not a very torquey engine low down. My old 3.0 V6 used to pull hard from 1500rpm but the straights seem to be a different kettle of fish.
I hope if makes a difference for you though. Have you got the special tool for setting the cam position or are you going to fabricate something?
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