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I owned an 06 TSX(K24a2), with an engine torque damper and I barely notice any extra roughness coming out of it when going up to 6000-7600rpm. This Subaru feels the same as the K24 but only with less torque. I dont know what the OP means by the FA20 engine feeling "not smooth 6k rpm and up" but it sure as hell feels smooth to me.
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