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the ticking sound is the valves and every N54 has it. if you're doing the cold start, the WGs are open and after some time they close. while they're supposed to be open and you hear rattle then they might not be open all the way and do cause rattling sound. from the video I couldn't tell. best way is to rev between 3 and 4k and see if you hear anything while rpm is coming down.
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