From the information gathered through the negative experiences of two (and hopefully not more) buyers, they found out that 2004 and onwards models did not, for some strange reason, meet the emissions standards set by the ADRs or whatever, even though the same engines were still being used as those in the pre-2004 models that ARE eligible for import here.
So, basically, due to some ridiculous red tape -and unless it's changed since then - you can't legally bring in and have complied any models built after November 2003...
There are a few threads on this, and a quick search will reveal more in detail...