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From wiki:
M52B28 = the 328 motor
September 1998 - steel liners rather than nikasil
1999 : A Technical Update or M52TU version added Double-VANOS and other modifications
One forum quoted as saying "vanos - few problems, Vanos2 - many problems" - is this correct?
That one should have the M52 motor which can apparently get a power upgrade by using the manifold from the M50. Seen on ebay labelled as such.
Apparently the 328 was limited for emissions hence only a tiny bit more power than the 325 in the spec.