Most interesting (I added the emphasis).Modular construction offers easy system expansion with future media.
Easy-to-use piano style-buttons and knobs can be operated without looking away from the road.
A “light bar” of LEDs mounted on either side of the volume control knob responds to operations, giving a visual impression that the car is interacting with you.
Steering wheel mounted audio switches provide easy, safe operation while driving. (Standard on GS and GT models and available with convenience package on GX model.)
Up to six speakers to deliver superior sound quality throughout the vehicle.
So... the Mazda 3 has a modular stereo system... does that mean that we CAN put an aftermarket stereo system AND add speakers on our own?