To Start off I have added only a stero System to my car, but I have a lot of Plans for the future. I've installed a Kenwood 45x4 headunit, a EarthQuake 500 watt amp, and two Audio Arts 15 inch subs. Along with those subs I put in two Image Dynamics 12 inch subs. Since I added those I needed more power so I got a Power Acoustics 300 Watt Amp. My system is really loud now, but am going to be selling it and going performance.