You need to be very careful here like mate. The sub box is what gives it its sound. If you are going to take it out of its box its gonna sound crap. If you are gonna mount it in the boot with Nee box you need to be careful and might need to mount some damping material to catch some of the sound, or the bass will just over ride everything, sounding sh!t.
It will look good, but you need to have it angled the right way too, to direct the bass, or again it Will just take over everything.