European-spec cars are generally more powerful thanks to higher compression engines. On the 6.9, for instance, US-spec horsepower is 250bhp while a Euro-spec equivalent puts out 286bhp and also 405Lb./ft. torque versus 360Lb./ft. torque from a US-spec engine. Euro-spec cars are definitely more desireable if your goal is to drive REALLY fast, but beware of them because most of them were thrashed hard on the Autobahns before being dumped on us when they would no longer pass the rigid German TUV inspection. Hope this explains it a little better!
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'93 300E 2.8