i purchased ebay headers a while back n tried the install..i got the screwed with the ones i purchased because the o2 sensor bungs were not properly installed in the right locations so i couldnt put them back in. as for the actual install..it is sort of a pain, i put them in by myself without removing the mount, i dont know how i did it but it was difficult.
more than likely u will throw a code or two because of the location of ur post-cat sensors and the readings they will get. either get some o2 simulators or run them down farther in the exhaust path.
good luck my friend