My friend is amazing at setting up car audio and he has set up some pretty amazing rigs before. There is two parts to it, the way it sounds and the way it looks. Lots of people are good at one thing or another but my boy is a master of them both.
I remember this rig he set up in a really nice looking escalade. The bass dropped like a plane crash but the escalade still had all its seats and storage capacity. He had made these custom cabinets for the speakers that blended right in to the interior design of the truck. It was slick. He's done all kinds of crazy stuff like that. I'm saving up my cash to get him to build me a system.