I thought you might be interested in looking at If A4 actually came to fruition, is it even necessary/possible for BIS to use a new modern engine?.
https://forums.bohemia.net/forums/topic/194606-if-a4-actually-came-to-fruition-is-it-even-necessarypossible-for-bis-to-use-a-new-modern-engine/?do=findComment&comment=3097306
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