I did my big 3 in 1/0 gauge about a month ago and haven't noticed a huge difference.. I think its cause i have a cheap-o batt. and that my HO alternator isn't putting out its potential cause the computer is regulating it... Time for a MLA Voltage Module.. and I want to upgrade to a Kinetik 2400.. that outta do the trick.. and i also think my alternator belt might be slippin on occasion. only runnin two kenwood amps to two 10's and 4 fullranges. about 1300 watts rms and have 1 run of 1/0 gauge ran as well as the big 3 and the 200 amp alternator(high output at idle) and a 300 amp Soundstream Capcell.. When im at a stop light at idle and bumpin its usually down to 12.5 volts.. Not too happy about that. But i think im in need of that stuff i mentioned before and it should be all good. Im confused why my lights still dim and shit when i have all my shit done right for that kind of wattage if not overkill.. if anyone has any ideas why its not holding a good charge lets hear it..