m106 exhaust manifold to head sealing

[Nebraska_e28]

Working on a new project. I plan to install an m106 exhaust manifold to a different m106 head that is not the original one it was mated to. Since these are partially sealed by copper rings, what are the odds a different manifold may leak slightly? My thinking here is that all manifold/head combos may wear slightly different hence swapping may cause a minor sealing issue.

[BMW Performance]

put new copper rings in it and you will be fine.

[Hgordon]

I'm doing the same thing except installing the m106 manifold on an m30b34 head. The copper rings appear to be $40 a piece which seems a little ridiculous, is there a non-factory solution?

[Nebraska_e28]

I dug this up recently:
https://www.bimmerforums.com/forum/show ... t-question

[Hgordon]

Stove sealant eh? I guess it's worth a shot if the rings aren't available anymore.

[Nebraska_e28]

On my other 745, I used a little wd40 on mating surface of the head & manifold prior to install. Zero leaks. But this is the same head/manifold combo that were married at the factory.