I've seen this brought up many times, but has anyone actually tried taking out the rear deck sub and replacing it along with a new amp just for that sub. I know it's pretty easy to tap into the wiring of the existing amps to run a new one, but I don't want to lose any trunk space.

Plus I have a fairly new 10 inch pioneer ib flat I had in my tundra that I believe is applicable for free air use, which this would be considered IMO