mine had a broken cassette player.
i traced the speaker wires to the amp in the trunk ,
and hooked the factory speakers to a small eclipse amp i had.
to the front (under the seats) i ran an extension cord and a headphone feedline.
these hooked into the power tap (there is an inline toggle switch to kill the amp)
from this i run a cd , or mp3 player.
sounds great , looks ok (just those two mostly hidden wires)....
and can be removed without hurting the 'factory' look.....
it works fine for me ......
(for those keeping score , it takes about three days , of being left on , for the amp to kill the battery)