well yes k20a3 is only 160hp motor,mine is jdm version,its jdm spec,(pna) series.has 3 intake cam lobes and 1 exhaust cam lobe while k20a3 has 2 intake cam lobe per cylinder,moreover it is different apparently too.
well atlast even if k20a3 is 160hp it still has hell lot of potential,can bear 600hp on stock internals,and has 191nm torque at stock :o
miine isnt k20a3,mine is like k20a2 (very close to it).
i'm finding a k20AR head and intake manifold these days(H)