my brother's integra as well as my old toyota made a whistling, almost supercharger whine sound at certain parts of the rpm band, when the motor seems to "open up" and rise in powerband. its proably more noticeable since 5th gear is longer ratio, so it probably is more noticable.

and yeah i dont think it really matters, most car manufacturers dont do extensive high speed testing to give a rats ass if a drag noise comes into play after 130mph. unless its like an exotic or something for top end.