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Similar to the 86/BRZ, the displacement is about improving drivability. It sounds like the engine provides more response down low and maintains a wide torque band. You also have to consider global emissions getting much more strict. While they could dump more fuel into the engine, that would mean a more expensive emissions system. The aftermarket will have to handle that.
Also, yes, it is about consolidating motors as they work toward a fully EV/Hybrid lineup, which means only having 1 or 2 ICE engines by 2030.
The only way the STI has 400 hp is if it is a hybrid. They could do it, but I'm skeptical if that happens this time around. Maybe next refresh. 320~330 is probably correct.
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