a subwoofer can easily be added to the stock stereo. If you take the stock stereo out, you'll lose your 6-disc in the trunk unless you upgrade that too.
The A4 stereos are all different... if you have a Bose stereo, the 2 6.5" speakers in the rear deck are actually subwoofers... you can easily get a signal from the rear speakers, but use a signal from both so you get the bass thats played in both left and right channels (even with a mono amp). Some european A4s have an amplifier thats mounted right to one of the rear speakers, makes things a little more difficult, but its still do-able.
Do keep in mind that the circuitry in MOST stock stereos limits bass output when the volume is high, this is to protect the speakers and keep the sound clear. This will make an impact on anything that is connected to the stock stereo....
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"Automotive Lighting Guru"
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