I have an HK system in my car and as far as I know, they do it in the factory. It's a whole new ball game when it comes to having to wire them up and I believe the radio head unit will have to be able to support HK also (I don't know if they already do) but that's something you may have to look into also. Just from looking at the wiring diagram for the reg system to a HK system is going to take some time. You will prolly have more money wrapped up in puttin that system in than what its worth. Don't mean to be negative but I just kind of say it as I see it. Good luck with what ever you decide to do