Here's the link to save the searching time since I'm in good mood
Beisan Systems - Procedures - Double Vanos Procedure

While you're doing the VCG, get the Vanos seals done as suggested and the sparkplugs too. I used VictorReinz on my E39 and it's showing seepage 2 yrs later. The E53 has the VCG from the dealer (in a bag without brand name)

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)