257's are semi-closed; they're braced a few points around the cylinder liner, but are still subject to more misalignment than a closed-deck that basically has a few holes for the waterjacket instead of a pool. Kevin's right, too, in that the ranges you see for high-power evos are all top-end - you don't see the same type of power delivery on a Subaru, for better or worse. High-powered Scoobies seem to make better DD's to me.
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