later 93s i think used less aggressive design. it was still more aggressive than the s14s though. That's what i picked up from FA.
As for the hp gain... AKADriver mentioned lubricants, so i was thinking if you are using very good synthetic oil, that might play a role as well. Like 1-2 hp i'm guessing.
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кто болеет за Зенит, у того всегда стоит!
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