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Granted it depends on the block and internals, but it is entirely possible. Throw a really aggressive heads/cam set up on it, plus your headers,intake manifold, throttle body, and other basic bolt on's. I fail to see why you think that its not possible to milk another 60-80 hp out of it.
I'm pretty confident that its a very conservatively tuned motor like most factory production cars.
I've also seen far more aggressive power gains from NA motors, for instance a 99 Formula with a heads/cam/intake/headers pushing 440 whp (305 is stock at crank).
Why do you find it unreasonable to put 280 out of a FR-S / BRZ
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