All I could find out as well was that they changed at some point in 2000! So a 2001 should be the 193bhp block.If you have a 530d same as me and 2001 plate, they came with 193bhp as standard, well mine did as standard, i think its like 2000 and under that they came with 183bhp. Some of the other guys will be able to confirm this for you anyway, just to give you a idea.