it's pretty easy. I know that Kevin wanted to redo his website and make a better write up, but I'm acutally trying to get a write up on this going as well as an article for RCC digizine...
dont hold your breath through, it might be a few months into the winter!
I know that when you do emissions removal, you want to send your injectors out, which is about $80 at either witchhunter or KG parts
Then you need about 10 feet of fuel line, I got 10ft, and replaced ALLL my soft hoses, including the ones in the back by the fuel tank, and I still got about 3 feet left!
(doing the rear ones is a bitch btw, it involves lowering the swaybar so you can get to the clamps, and etc)
I would also get a new fuel filter, and do the banjo bolt mod NOW since it's an S4 and you dont want it to catch on fire. (you use a banjo bolt to replace a "fuel pulsation damper" which often goes bad, and gives you an engine fire, is expensive to replace, and the car runs fine w/o it on.
Then, I would get an S4 oil metering pump rebuild kit or block it off if you dont mind putting 2 stroke oil in the tank.
5/32 vaccum hose, you can get a 50ft spool of it on ebay, for CHEAP! Also get an assortment of vaccum nipples a 5 way vaccum splitter(for the oil injectors) a vaccum T or two, as well as a few more 5/32 caps cause you will run out of those.
umm... what else... you could give your intake manifolds a bath in the hot tank as well to remove any extra crap in there... I got that done at a carquest, they had a machince shop in the back.
I will add anything else I can think of.
I just did all this shit in the midst of putting another engine in my car.