nismo metal head gasket. multiple thicknesses up to 2.0mm im sure.
The goods in my opinion

An A15 I had o-ringed. From memory the ring is 1 long piece covering 2 cylinders making a figure 8.
I will try and dig up a better pic.

so where can you get the nismo or tomei product in ozor do you have to get it from japan?

ask bige he has them

I use the genuine Nismo gasket which has a wire ring under the fire ring for extra 'bite'. (Note some have this some don't). It's on my 13:1 C/R A series race engine - no problems. Expensive but they don't blow. I'd suggest they'd be good for turbo too.

I would recommend to make your own copper head gasket.Or have one cut out. That way you get the thickness you want and quality too.
I had one made for about $80

No more gasket problems. Too Easy

I can supply Nismo composite gaskets or Kameari Metal gaskets.. :)