Well where I live there is a place called Abt that installs for Porche, Ferrari, corvette, etc. they have a 6 car work area and there are usually very expensive cars there being worked on I've seen G3's completely gutted for sound sys. installations. I had my STi worked on there as it didn't come with a radio at the time of purchase. They completely cover the car areas that they work on with plastic and do excellent work, sub woffers, etc. I don't recommend places like Best Buy, etc. I don't know any in CA but I'm sure they exist. just ask around. By the way, when I purchased the head unit for my STi it came with a life-time subscription to Sirius Satalite radio for $350.00.