I am thinking of going with a set of 10's-or 12's. My installer said that if I do that, I will have to use a box that ports directly into the rear deck in order to be able to hear it. Meaning that unles I port the rear deck some how, the sound will stay in the trunk. With the amount of "flex" in the trunk, leather seats, the sound will be great in the trunk, but not in the cabin. I have seen some of the posts in here where some of you have cut a good sized hole in the rear deck. I want to keep my spare, I have already purchased a set of boxes that are custom made for the Impala SS quarters. http://home1.gte.net/bristra4/impstereo/index.htm I bought them from a fellow member. So, what facts do you have for me?