A turbo manifold is subject to high heat which is generated from the turbo charger, this heat along with vibration from a high revving engine is a environment where nuts expand from the heat and work there way loose. This is the main reason why a lock nut should be used when installing a turbo or manifold.
Your turbo flange lock nuts will be subject to higher temperatures than your manifold to cylinder head ones, we recommend replacing your lock nuts every time they are taken off.
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