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I think it's noteworthy that the power increases have stopped.
With the ginormous bores Porsche uses and the high rpm these run at, there is a bit of room for improvement from higher combustion speed. I wonder if it's possible to tuck extra spark plugs into the head. A better but so far unproven method would be corona discharge ignition. In fact since the GT3 uses high overlap fixed profile cams, corona discharge ignition would be very useful for idle stabilization and fuel economy as well.
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