i used to install really expensive and show-off competition level systems into my vehicles before but i have stopped doing that since i have my vehicles broken into and systems as well as CDs stolen (lots of CDs that you can't get anymore) - so those really show-off systems make your car into a target - and i'm no longer interested in spending money to just enrich the bloody thieves in my town - and it's also a reason why i\m not bothering to buy decent cars either - right now i have a 2011 Nissan NP200 bakkie which i'm going to keep till it literally falls down and it never even came with a standard radio - so not bothered to install even a very cheap one
also nowadays i very rarely go anywhere alone so i rather just pass the time by conversing with the people who are in the vehicle with me instead of being rude and playing loud music and having them sit and listen to music that they probably won't like