Zhenqing:Congrats! The Z3 is a great car, as are most "beemers". I own a 2003 M3 convertible. Nothing compares with the joy of driving that car...it goes from 0-60 mph in 6.8 secs, which is faster than a Porsche 911 Carrera
The R1100RS will do it in about 3-4 seconds.
Real BMW's are boxers, just like the 911.