I've researched the all aluminum radiator and its a must for a better cooling system in the 540i. I don't have it on mines yet but will do the conversion once I get the money together. There is a guy on YouTube that shows how he did it on his 530 I believe and u can see his electric fan setup too on his channel. Il post it once I find it. If I were u go with a manual trans if I can get ur hands on one but if u prefer auto that's cool too. I just think the manual trany is more reliable.