I'm surprised the manifold is even capable of cracking right at the spot in the pic above. I mean, the crack is right up at the start of the manifold between sets of bolts that should hold the cracked pieces together fairly rigidly, so there shouldn't be any really huge differential in mechanical stress on the two sides of that crack. I could understand if it was closer to where the turbo mounts at... but that pictured crack would seem very likely be a design fault with the item under heat stress.
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