I am interested in purchasing a used Z3. I started auto-x last season in my 1995 318 and thought the z3 would be more fun. I am trying to decide between the 4 or 6 cylinder. Even though the 6 would be faster, the 4 is more in my price range. Can anyone offer comments? Is it worth spending more for the 6 cylider or is the 4 cylinder just as good? (isn't it lighter?). Kim