Caps have a purpose. I am running approx. 2100 watts in my car (not my Z) and even with a 200 amp alternator my lights would dim. Multiple batteries only exagerate the problem because when you are driving they are an added load to the system. A capacitor on the other hand acts like a dea short once charged (about .2 seconds) and act like a rapid discharge battery to maintain the voltage level of the electrical system. The better you maintain the voltage the better your system sounds and the longer you electronics last. Before I bought my CAP my lights would dim with moderate bass and pretty much shut off when I cranked on it. Now with a 5 Farad Alumapro CAP the lights don't even flicker. I even picked up 1.2 DB of volume.