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well it's true that the bluetop 4a-ge had lower compression, big ports and a strong block that could handle a lot of boost with stock internals.
later generations were less boost friendly stock with higher comp, itbs, etc etc but still remain very popular with tuners.
i see fa20/4u-gse as toyota/subaru starting off with the blacktop/silvertop (optimized n/a engine)rather than the blue top (not a lot of stock performance but good for n/a tuning or boosting). if toyota/subaru tried to build an engine that was good both for boosting and n/a tuning, i believe we would have all been disappointed by the stock performance numbers.
either way a supercharged version is supposedly in the works. who knows, maybe with some creative plumbing even the turbo fa20 going in the next gen wrx might fit in the frs/brz.
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