Yeah, I ended up doing 2 runs of 1/0 from the trunk batt(s) to the alt bracket for grounds. That should help. Also, Your Cobalt is hella' clean. it's what inspired me to do a large system in my pusuit (same car). I heard you are maybe doing a rebuild? I'll be tuned in.
yes sir i am, new subs should be here this week but its gonna be a minute till the new wall is built. all im gonna say is that its going to be a below 20hz monster.