Hey, i have a 2007 GMC Sierra 1500 Classic. i am about to purchase a 2000W RMS 1ohm and 2800W Peak Power at 1 ohm monoblock amp for 2 12in sub woofers that are wired for 1 ohm. what is the most cost effective upgrade to get the amp all the power it needs and to keep my battery from dying and my headlights from dimming. Thanks.