Hose Replacement
 

OK.
So I live in Phoenix, AZ and the heat destroys the rubber. I have little hoses everywhere that I would like to replace, but I have no idea what they do or what they are called. Is there some sort of diagram out there that could guide me on this? Also, does anyone know where I can get these random hoses to replace them?

Along those lines, I also have a problem that popped up last night. There is a hose that runs from the right end (facing the engine) that runs out of the end of the header(?) and down into what I think is turbo related tubing. There is a little regulator or something in this line that is falling apart. I get air hissing when the engine is running. I used some tape to seal, but would like to replace. Any guidance?

2000 S80 T6

Thanks.