Changing from 20d or 25d engine to 30d engine (E39)

Hi!

I am new in here but not really new to BMW stuff and would like to put a question:

I plan to buy an used 530d Touring (E39) but as i am looking for them and depending on possible solutions i have i ask:
(the car i am looking for is a 530d with manual gearbox)

Changing from a 20d or 25d engine (E39) to 30d (E39) engine is possible, with manual gearbox ? What items should i change besides engine ? Is this a possible upgrade, i mean what kind of things would i expect to change from one engine to another ?

Thanks a lothttp://forum.beastpower.com/bp/images/smilies/idea.gif