So i'm looking to go louder, current setup is a Zv.4 15" on a BC2000D @ .5Ohm. The first thing I need to do is upgrade my alternator. I've done the big three, have parallel runs of KNU 0 Gauge to a group 24 AGM in the trunk. I've gone into the ECU and bumped up my idle RPM as high as it can go...