Manifold sealant?

[Ignorant import guy]

Is there any type of putty or sealant that will not be affected by the heat from a turbo manifold? Maybe muffler putty. My t3 has a circular t3 flange and my manifold has the standard t3 flange and there's probably aout a 2mm gap I'm tryig to fill in.

 

[get_nick]

you're probably going to have to weld it. stuff like jb weld wont hold up.

 

[Ignorant import guy]

yeah I figured I would but cast iron is pretty hard to weld isn't it. I mean if I can't do I know people who can.