I was poking around the internet trying to find more HR16DE info and found this dyno chart. It is from a Nissan Versa Note (which shares the HR16DE with the Micra). The blue line is stock, the red line is with an Injen intake kit added to the car.
Now of course, it begs the question, does the Injen intake fit the Micra?
Note-ified also shot a quick video to show off the sound: