Installing a whole new system in my car, consisting of, iva-w505 head unit, 2x mrp-m2000 amps, 2x type x 12" subs(1000/3000w each), and spx-17pro for door speakers(100/300w each x 4 for each door = 400/1200 + 2 subs = 7200?, Do i need a car battery and if so, what and how many? I drive an 02...