Can anyone tell me what this is

[Baba]

Maybe even point me to where I can find details about the engine bay. This is a new car for me and im trying to figure out what everything is. Its a 1997 2.8

 

[AntStark]

This may help you

RealOEM.com - Select Your BMW Model

RealOEM.com BMW Parts website. This site can be used to look up BMW part numbers and approximate part prices. The Parts are grouped into diagrams and diagrams are grouped into categories and subcategories

www.realoem.com

Not seen in that position before but that looks like a secondary air pump. Helps with emissions on start up ..great if you live in Cali ..most people get rid of them.