I have a 145 amp alternator. I haven't done the big 3 yet because the wires in my car is hella confusing. My setup is 2 12" jbl gto series sub with a visonik v4000vd amp. I'm running 4g wire but i'll be upgrading soon. Maybe 2g or 0g wire, depending if i can fit the 4g wire through my car or...