ii have a completely stock electrical system currently but i have everything i need to do the big 3 upgrade, and plan on buying a new battery but i have a few questions. 1.) Is adding a second battery a good or bad thing. I've heard both ways so i would like some actual imput. 2.) Red or yellow top optima. Like i said earlier i'm not doing any db drags or anything but my current battery sucks! I would just like to have a constant voltage cuz right now its all over the place. And eventually i plan on getting an HO alternator but currently don't have the money for that kind of investment