i've actually taken my lower 7afe pipe and bolted it onto the 4age head pipe at the flange. it would have probably worked good except it stuck the whole pipe assembly lower than where i'd like it. i'm just dealing with the header mid pipe close to my oil pan for now till i get my fujitsubo header fixed. you can't go wrong with the cheap stainless ones. the biggest part is once you install it, you
NEED TO WIPE IT OFF WITH RUBBING ALCOHOL OR ACETONE to get all the grease/oil/finger prints off it before you fire the car up. if you don't those will be permanently burnt into the metal and gives you the cruddy appearance. if you clean it before firing, you'll maintain a nice Blued finish.
here's a pic of the 7afe down pipe with the 4age header on my 20V.
and the 4age stock mid and back pipe close to the oil pan.