Subwoofers in a cruiser mopar
I cut the dash frame which wasn't original anyway for a head unit. Have 2 amps. Planet Audio amp feeding a JL 10' sub. An older kickass Fosgate Punch 4-ch amp feeding 6 speakers. It doesn't rattle the windows four blocks away but I didn't want that.
There are quite a few Bluetooth options out there now days so an in dash head unit really isn't needed.