The standard SLKs are slow but the AMG versions aren't too bad.
Below is some info on that AMG car .
These numbers are from a Motor Trend test:
0-60 in 4.62sec, 1/4 mile in 13.06sec@108.74mph.
Curb weight is 3220lb. 349hp, 332ft lb tq
Here is a picture of one.
http://www.rsportscars.com/foto/08/m_slk32amg_front.jpg