big 3 would help, but it is not necessaryHe is going to need to know how to do big 3, show him the sticky link. When I ran my BL I had a kinetik 800Hc front a 2400Hc in the back. I would reconmend Picking up a 800Hc you can find them on ebay for 100$...I don't think a stock battery Can handle 1500rms. What do you think??? that sundown only needs 12.4 voltage So he might be fine with the car running.