MBZ announced at the Detroit North American International Auto Show (NAIAS) in January that the 2001 SLK roadster will come to the U.S. with the 3.2 liter dual plug/3 valve engine. It will be designated the SLK320. A new 6 Speed Transmission will also be available.

... and not forgetting COMMAND and finally elec. seats! ehehehe... small but important options... eheheheh :D
Regards,
Chung