T4 manifold/wastegate HELP!!! *PIC

[4g63telantra]

Alright so I picked up a Garrett GT40 a few days back and seen that the flange on the turbo that sits onto the manifold has 2 holes.


Ill be making a custom exhaust manifold for this turbo and just wanted to know if I should run a colleter that goes from cylinder 1,2,3,4 into 1 or from what I was told is run cylinder 1&4 into one hole of turbo and 2&3 into the other.

Also as for a wastegate, If i wanted to run 18psi everyday, what spring would I have to run?

I may run dual WG set-up if I run runner 1&4 into one hole and 2&3 intot he other.

 

[fwdturbobov1996]

Well with a big turbo like that on that " little " boost for that turbo. The bigger wastegate your going to need. It might want to creep. Id say atleast a 40mm if you plan on running below 20 on the gt40