The factory inlet is in the front-top of the driver side radiator mount, to begin with. So yes taking the bumper off is a necessary step (as it is for many modern cars now), but really it's not a big deal. Two people can get the thing off the car in less than 5 minutes, and that's at a leisurely pace.
This isn't a mod I would be interested in, but I AM at the very least, interested in knowing if there's any noticeable difference in intake charge temperature. Which an OBDII connector and app would be able to show. As for the ram-air effect, I'm pretty skeptical of that only because the entire intake system for this car is anything BUT a straight-shot and the ram effect may not be as great, given the curves it has before it even hits the airbox.
I also wonder if there's any effect at all in simply removing the curved outer inlet and leaving it at that.
Just being skeptical.