pcv valve (Positive Crankcase Ventilation) releases pressure that builds up in the head, so seeing oil there is ok, since you got ~50k miles just to make sure go replace its only like 5$ or so,
it depends actuly, if you have hard pipes owready i recomend to go with upgraded smic, if not fmic will cost you about same, also how much power you trying to run. with stock turbo smic will be plenty for you
depends on what fmic you decide to get, some need you to cut stuff and some are just direct bolt in, or you can just get upgraded side mount wich will be plenty for you, this whay you can keep youre hard pipes if you decide to get them.
Like the topic says looking for stock injectors and harness i know there are plenty of crashed cars out there and people swaping out to biger injectors so some one shoud have they laying around.
thanks