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Purely anecdotal evidence here, but I noticed this a bit when stock. I just eclipsed the 1000mi mark and drove aggressively a few times and wondered if it was VVT or my TRD exhaust resonating in a crazy way.
Went OFT stage 1 this afternoon, and I can say it is definitely more pronounced, but that could be because I seem to hit that RPM range more often and it passes more quickly. Either way, I'm not worried - I think it is just a characteristic of this engine.
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