I assume the battery is under the hood. If at all possible I'd upgrade the front battery if you have no available space for an extra battery. I currently run my 2k5d off a single NSB G2700 under hood with stock alt and get very minimal light dim at power tested 2k power so you can expect the same if not more with a better battery and your alternator. Also need probably more than one run of 1/0 power wire with a solid ground. So just a better battery under hood good wiring still looking at a solid 2k power at 2ohms.