Full Exaust System
 

Ok so I am looking at doing a full exaust system for my 1997 Audi Cabriolet. I know i will prob get flamed for this but I have only been able to find bits and pieces about doing a full system. if any of you got likes, they are welcomed.
anyway so I am looking to do a full exaust upgrade, I found the muffler I want from magnaflow. we can start with the headers: do I need new headers? or can I just skip down to the cat, and start the system from there?
I am looking for a deeper, throatier sound so does anyone have any suggestions for a cat-back system? on that note am I even on the right track for this?
I have had some experience with exaust, but I compleatly skipped cats and went stratight to muffler (it was on a '31 ford hotrod, hence the lack of cats). can someone point me in the right direction?