As I understand it the vanos is activated by oil pressue.. Apparently there are seals that keep the pressure from leaking out.. I've been told by a friend that owns and E46 323 that replacing your vanos seals makes a world of difference. and your car seems to have new life. He claims he bought a kit for 60 bucks and he said his power was better throughout the rpm range. Do you guys buy this ... and if its truely the case with E46 could it be true for the E36s as well even though my car isn't dual vanos.. I'm hoping that this is true so that my car can have a little more perk =) who knows what im talking about thanks.