Thanks Ahmad, pleasure to see you. I remember you said the same thing couple of years ago, that you'll pay attention to car audio.
We all shine, tune, and customize our cars but we (almost) don't try to improve in car entertainment (ICE). With just replacing front door stock speaker to a decent full range speakers, overall experience is improved by 30 to 50% (starting cost 5k to 10k).
With more and more traffic on the roads, the importance of ICE is greater than ever. Just imagine, you are stuck in traffic and you don't mind it, you wish that the signal goes red so you could finish listening to your favorite song before you're home!