Dave,

I was incorrect about the 221HP number for the CLK320, I thought I saw that somewhere on the web. However, I'm looking in my Owner's Manual for the 2002 C-Class under Technical Data and it states (Page 377):

Output acc. to SAE J 1349:

C240 - 167hp/6000rpm
C320 - 221hp/5600rpm
C32 - 349hp/6100rpm (WOW!)

Maximum torque acc. to SAE J 1349:

C240 - 177ft lb/4500rpm
C320 - 228ft lb/3000rpm
C32 - 333ft lb/4400rpm (NICE!)

What gives, anybody care to explain?