Mine is doing it now. Freaked me out I thought there was something wrong with the engine . It did not sound like engine though, but ticked after I got to 4k RPMs. I thought my cam timing was screwed almost drove straight to the dealer, but they don't open for 2 hours. Once I read this I turned on my AC and then revel to 4k no more noise.
Sounds like a balancing problem on the motor or flywheel if it can make the car parts tick to the rpm.
Another thing to add to my fix list for the dealer.
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