I have decided to keep my '07 WRX STI completely stock. So herein the question lies. I bought the car brand new and being one of the last ones' on the lot it came with the factory stereo only. I did not have the option for the factory subwoofer and amplifier. We all know that the factory stereo sucks, but is it even a little better with the addition of the subwoofer and amp.? And is it a module plug in I can do myself should I purchase it? I love my tunes loud as much as the next guy, but I have another car with a decent aftermarket sound system I drive if I want to blow out my eardrums. Thanks in advance.