Vanos rebuild is extremely easy to do, especially when you're already in there with the valve cover off. get the vanos kit from Beisen Systems as well as a vanos to head gasket. Beisen has directions on their website and it's extremely simple.

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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium

Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver