I am unsure what the factory fits however when our 4/4 was built we optioned it with the stereo installation kit and selected our own stereo head unit when the car arrived in Australia and had it installed by the local dealer. We went for a Pioneer unit with single CD, remote control and bluetooth so we have hands fee for the mobile phone and can stream music from the iPhone without needing cables. The speakers fitted by the factory were Clarion units although I'm thinking of upgrading these. Of course once you get over about 80 - 90 kph the quality of sound is all a bit academic as you cannot hear much, particularly with the side screens removed.
