I own a 300ZX and am ready to take the BMW plunge. I have studied the M3, but find it hard to locate info on changes between the model years. I want the most powerfull engine that comes standard between the above years. I would also like the VANOS system in the years it was produced. Any help or a reference to the info would be appreciated. I must admit the M3 is everything I want in a car, so I want to get the best deal I can. Thanks again.