I have recently got my hands on a BF XR6 (didnt get the turbo cause on my Ps

) lol. And after a close analysis i am happy with the premium sound system that came installed with it but i want to disconect the 8" sub that came with it and attach a 10 - 12" sub(s) and connect em up with a new amp. I am just curious to how i should go about doing this. And also what equipment i should buy todo this. I also do not want to change the speakers already in the car if i do not have to.
Thanks heaps for all who can help.