I need a second battery in the trunk so I can hook up my amps to it. I currently have a D5100 under the hood with a big 3 upgrade but I want one another battery in the back so I don't have to run power and ground wire for my other amp. I have a sundown 1500D and a JP8 from d4s for the doors but its not hooked up yet. I am running two 12" Icons. I was looking at the 3400 preferably or another 5100 to save room in the back of the trunk. I drive a 19 Impreza sedan. Also not sure if I should buy another sundown 1500D to push the subs even harder or just sell the one I got and get a bigger amp. Just looking for some advice or tips.