First issue, rattle: Catalytic maybe. Heat shileds around above exhaust pipes.
2nd: Is the pedal itself squeaking when you actuate it? My 318 did the same thing. I lubricated the linkage and it went away.. or is it the actual clutch? squeking when engaged or disengaged? How many miles? Have you ever changed your clutch?
"If everything seems under control, you're just not going fast enough."
- Mario Andretti
1979 320is RiP
1994 318is Sold
1995 325is Sold
1995 530i Sold