I have seen them, not used one personally as I get my own tubulars made to my design.

Their K04 manifold is lovely looking tho.
 
i would ask how tey would prove that before i made a purchase

Analysis of the failed manifold would be able to show changes to the physical properties of the 321SS, at temps that high you get migration of carbides in the structure of the metal which leaves an area harder but more brittle and hence more likely to crack.

Microscopic analysis required!
 
Analysis of the failed manifold would be able to show changes to the physical properties of the 321SS, at temps that high you get migration of carbides in the structure of the metal which leaves an area harder but more brittle and hence more likely to crack.

Microscopic analysis required!

there's your ansa lol