Just to update this thread... I got this manifold
And for flow and heat works pretty well I can say it works way better that stock avenir manifold I had (which got hot like hell) now it gets hot but pretty normal as now I get 1500°F at most (cly #2) when WOT and before I used to get 1700°F or more with stock avenir manifold
Bad news is that material used is so thin that it cracks a lot!!! And when I say a lot, it really means a lot!! At about 20 to 30 wot passes and a new crack develops and you can start hearing the exahust leak.
We have added some strenght to it by soldering small metal sheet plates between collectors right where the T2 flange is and this has make it last longer but eventually cracks again and the nice looking manifold you buy is not that nice anymore after doing this.
Next time I take it apart I will take some pictures.
PD this is the manifold I am currectly using
AUTOBAHN88 Turbo Exhaust Header Manifold Nissan Pulsar GTI R RNN14 SR20DET | eBay
and it ain't that cheap.
So in terms of design it's good but on terms of material used it's pretty bad.