I got email back from the sales guy at FP (the one who sold me turbo). He said i need to ship it back with hot side attached and also include oil feed line. I emailed back asking for confirmation on why hot side needs to be included. (I really don't want to remove hot side and replace gaskets and run into risks of breaking turbo/o2 housing bolts. I could be wrong, but including hot side should be optional. I understand about possibility of more damages during shipping but that can be addressed with proper packaging.