I used to be into car audio, but have move on. My first system was in a Lexus ES300. The second system was in a beater Kia Sephia. The Kia system I built with my son. We did all the installation ourselves. From wiring, capacitor cap, speakers, sub woofer, and 2 amplifiers. It was a labor of love.
But those days are over. Still have some of the equip. from the Lexus. I think I'm ready to part with them now.