My Rb25det Turbo And Manifold Upgrade

[youbUTEy]

ok, i am new to this forum, i have been on boostcruising before but have been told this is the place to be for help on skylines

now, i am upgrading my turbo and manifold, and indeed whole engine bay, and i have a few questions, i live in a remote country town so i have no services at my disposal, nor can i just pop into the shops and grab a silicon hose so i am doing i t from scratch and online lol. and i have just bought a new high mount manifold, turbo, and wastegate, and i just wanna make sure i have it right before putting it together. although there is a boilermaker who can weld for me

firstly, on the external wastegate, its a 38mm, i dont know what psi the spring is loaded at, but there is the barb at the top, and a threaded hole at the bottom and i dont know what they are forr, see pic, so if you could tell me that would be great.

and second, on the exhaust side of the turbo, do i just get a gasket made up to suit the plate, and get an exhaust (dump pipe) made to fit??? and wtf is that little hole? it just goes right thru to the intake, my old dump pipe has 2 pips into 1, do i just do the same thing with this?????????

i guess the question is how do i connect the turbo to the exhaust? ((and there really is not much room behind the manifold down to the exhaust, how have people overcome this??))

or, i have found these on ebay, but they dont have the 2nd little hole, can i just block up the hole with the flange and gasket????

or do i need to have the smaller hole coming into the big pipe?

and 3rd, on the turbo itself, what is that little bolt at the end before where you connect the cooler piping? that little brass bolt?? what is supposed to go into there?

thanks heaps if you can help me out