OEM Pioneer subwoofer

i have a 2002 mazda protege 5, and was wondering if it was possible to install an OEM Pioneer subwoofer into the rear trunk. i just realized that the harness is not there, and am having trouble finding info about it in the forum. any help is greatly appreciated!
 
It's not worth it, by the time you buy a stock sub and install it you could have bought a decent aftermarket setup and it would be worlds better than the factory setup.
 
Oh, you tap into the rear speaker wires, it also requires the whole plastic tray thing too, my P5 didn't have a sub.
 
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