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The engine is further augmented by an acoustic control induction system, a dual VVT-i (variable valve timing) that regulates intake and exhaust camshafts, an electronic throttle control system, and even iridium-tipped spark plugs.
Source: https://www.slashgear.com/1349284/most-reliable-lexus-engines-ranked/
Toyota notes that three different bits of tech work in unison to make VVT-i possible.
Source: https://www.slashgear.com/1430596/honda-v-tec-vs-toyota-vvt-i/