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I'm pretty sure most of these gains come from cooled EGR. The electric water pump would only help a little, and the rest of the engine is unremarkable compared to the 2AR predecessor. Direct injection and high compression only adds a small bit.
It really just goes to show that older engines were just really held back for cost reasons.
What is really interesting is that Toyota is sticking with relatively large displacement NA when Honda is committing to small turbo engines.
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