first here is my setup:
Race ported motor, T70BB with .84 A/R and i'll be getting a custom tubular manifold.

I already have a used Turbonetics Racegate with a 10 psi spring, it was used for only 2 months and is in great shape. Should i use it with my T70 or will i be better off with a Tial or a HKS WG??
will the Racegate be affected by the high EGTs, if its not attached directly to the turbo?

 

What's the boost you are going to work? I would go with HKS GT WG not because the racegate is not enough but because i don't trust them at all. 3 days ago a friend of mine with a honda integra turbo spooled 1.9bar boost instead of max 1.2bar he supposed to work due to a broken racegate....guess what happened...BOOM!

 

i'll most likely run 12-15 psi on the street and 20+ psi at the track.

 

i'm running the 50mm HKS racing wastegate. works for me

of course my turbo is quite smaller than yours, 60-1 w/1.0 divided a/r

 

a tial 46mm is good enough. stevenoz had that with his bbt70

 

I have had zero boost creep with a new Turbonetics racegate and a T-72. Works much better then the Apex WG I had before that stuck shut a few times.

 

I use the racegate, It works fine for me.