Hey guys, I'm still waiting on my sundown x-12 d2, so I figured I might as well get a jump on the rest of my build. I have a 2007 pontiac g6 3.5L, currently everything stock. I already have one run of kolossus flex 1/0, and will be adding at least on more, as well as doing my big 3 in the same wire. I'm gonna be running at least 2k daily on that sub, and have gotten quotes on alternators.. However, a mechman rep told me I should be alright with a 170 amp (my stock is 125). Singer told me that I should have at least a 250 amp alt. what would you recommend? And I will be buying 2 xs batteries, a d-1200 for under the hood (only one that'll fit apparently) and the most likely a d3100 in the trunk. Would you also recommend grounding the amp back to the battery? I've heard it's better than just grounding in the trunk. If anyone can provide some solution to my situation it would be great. Thanks guys