Door panel Rattle drivers side & Muffler Rattle on 2001 Porsche Boxster S

I just bough a 2001 Boxster S and have the Following Problems:

** Door rattle on the Dirvers side. How do you remove the door panel to see what it is?

** Intermittent muffler chatter. Check for loose brackets found that the muffler need to be replaced?

** How heard is it to replace it?

*** Where can you get a good price to buy it?

Asked by for the 2001 Porsche Boxster S
I just bought an '01 boxster and have the exact same issues...what did you end up doing to fix it?
I have the same problem. What is the fix?