I have a 38mm tial wastegate no creep or anything. I would go with tial if you do more research like on honda tech in the FI section most ppl run tial wastegate.

I have a inline pro stainless cast iron log manifold. They are awesome never heard ne thing bad about them and they are a brand name in FI. use a t3 flange

if u have mainesteream make you a manifold just have them do it all way with their flange. Ask ATLTSX how his manifold is doing he got his made from mainstream. GL