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The only official subaru reference I could find on 13.5 is on subaru america relative to the turning ratio. And toyota Canada specs out 12.5 compression ratio for the gr86. I’d be very surprised they would have built and certified two different engines between the brz and 86… it just would not make any financial nor engineering sense. It must be a mistake. The difference of 4 HP between japan and North America due to « emissions regulations » could be as simple as adjusting the redline a bit, which would change max power on a high revving engine.
Anyone saw other data points ?
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