here's my take on headers....

1.Which type of headers do you own, ceramic or ss?
DC sports 4-2-1 ceramic

2.How long have you had the headers for?
abt 1 yr

3.How is the discoloration of the headers as time passes?
not much discoloration

4.With the header, how hot does the engine bay get?
abt the same w/ stock headers

5.How hot does the hood become with the headers?
same as above

6.Is the gain significantly noticeable?
i noticed a gain in the low end and a slight gain throughtout the rpm.... 4-2-1 headers helps in the low end and 4-1 headers helps in the high end...... i dunno y ppl keep saying they feel gains in the high end with the 4-2-1

7.do headers increase noise level? if so, by how much?
the more bolt-ons u have, the louder the setup will get.... not much tho

8.what are the advantages and the disadvantages of having headers?
looks good, and give u a lil more power

hope that helps