How can I install a sound system in my '04 Mazda 3 Hatchback?

Bobby Light

New member
I was wanting to install 4 new door speakers, an 400 watt amp, and 2 10" subs. I still have the stock stereo system in the car and I really do not want to change the face plate out for an aftermarket stereo face. I know I will need some hi to low crossover wire or something for the stock radio, or is there a way to replace the component of the radio but keep the same face? I also need to know how to install all of this and the measurements of the door speakers if possible. It costs way to much money to have this installed by someone else.
 
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