The biggest difference in VANOS and VTEC is the way it works. In VANOS the cam is retarded and advanced. In VTEC the cam has a second set of lobes that are slid in place at a certain rpm. That, of course is the simplified version. Both try to do the same thing, more torque at lower and mid rpms, more power at high rpms. Great explanation c4talyst.
1995 325I, tinted windows, K&N, debaffled air box, BMW style #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 style heated mirrors, various interior bits, Bosal cat-back