Actually, the peak torque figure is pretty low for a 2.4 liter engine... however the torque curve is reasonably flat--that is what's important.
Most of the time (but not all the time) a manufacturer's specs tend to be a little conservative... representing an average set of numbers that *most* people would attain. Some of us can squeeze more from the same car--by shifting faster, by spending a great deal of time tuning the engine, etc.
The data in an automotive magazine is similar--the final numbers are usually an average from several runs.
It is obvious that you have one of maybe just a few 240Ds that will attain such a seemingly high speed. Keep her tuned up good!
-Joe