Possibly, but not the way you are probably thinking. Contrary to popular belief, you are not supposed to install such a subwoofer without putting it in an enclosure (box). Yes, some people just use the trunk as the box, but this is a bad idea. You will never even come close, I mean not even close to using the full potential of the sub by going with that type of install.
Now, there are such things as "Free-Air" subs, these do not require a box, and are designed to be installed in the manor your thinking of doing.
So, either put that Kappa in a box, or buy a free-air sub. Personally, I would just build a small box that tucks away in the corner of the trunk. Oh yeah, I did. :P