Could be the injectors that you're hearing. If that's not it, you could be hearing the ticking from the VVEL.
When you first cold start your car, most of the oil is at the bottom of the pan so it doesn't properly lubricate all the head components. I would try switching to an oil that's ester based. The ester leaves a thick film on the head at all times.
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'08 Infiniti G37s - Forced Induction Fed
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