If you car is 2002 or earlier, the speakers in the door are already woofers and your stock amp is sending them only (or mostly) bass frequencies.
Radio-wise a 2003-4 car is apples/oranges different than an earlier 986, so we need to know what you have.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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