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Heat wrapping a manifold especially a cheap one will make it more prone to cracking. You're subjecting the weakest part (welds) to more stress (heat). If they are shitty welds they will be more likely to crack than if unwrapped. Also if a crack start to develop you will not see it as the wrap will be covering it. I have used wrap on my downpipe forever with no issues.
I've had no issues with turbo blankets on the turbos i have run.
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