You guys nailed it down... It's the U.S. "030 Package". It's about 8,000 Euro, or 11,000 U.S.
I'd opt for the SLK 55 and pay for adjusting the limiter and tweaking the suspension knowing the facts. A 400 hp SLK 55 with a tweaked suspension sounds fantastic for an already great car.

Has anyone here performed these mods and care to comment on the increased performance?
Thanks:
Dan