Not sure what you mean by "keeping it inside the car", but yes...you can easily add a sub/amp or replace the current 8" sub with something. Adding a sub/amp will be 10x better though
Blkmz3- the stock sub is located in the middle of the rear deck. Go to the trunk And pull the clips off the top liner so it'll come down and see if your sub is still there. There should be a harness there that he might have unplugged...just need to plug it back in. The previous owner likely used an LOC, so he cut those wires near the stock sub And wired it into an LOC so he could use an aftermarket amp.
Trunk-Monkey, so the sub is that center piece at the rear windshield window? There are 2 speakers on each side and a center piece. I'll check if the harness is still there but I did see sep wires for the aftermarket sub. a 12v and ground and a 3rd wire.
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