Ok so my DC's have an exhaust leak because they craked. I took them to get them welded today but there is another crack . Is welding these an effective thing or will it come apart?

Also what kind of header will fit a d16y7? (ex header 96-00 or what?)

And HOW can I tell what my hatch is???? If its a dx or cx??? (its 96 and has a d16y7) thats all I know.

Sorry for the newb questions but since I used to have a gsr, I am more familiar with the b series and integras so plz bear with me. Thanx