Audio Systems: QUESTION, 2004 mazda 3, rca jack

Question
Hello...I have a 2004 Mazda 3 & I am looking into buying a stereo system..I have a 6-disc cd changer & I am trying to figure out if i need to buy a in dash cd player or is the car built with the outputs needed to connect an amp & subwoofers? I would really appreciate your help. Thanks

Answer
yes you need to get a kit to replace the factory head unit
the car is not build with anything else if you want  to add amplifier you need a low level interface and that will give you the rca jack for the amplifier

call 407-933-1065 they are only $25.00 and the have one of the best ones
good luck