what's your current system? just curious because there are a few minor things you can do to get around having to upgrade your alt depending on what you're running.
as for how much output from your alt is safe that all depends on your wiring and your fusing.
well i had a 1000/1 to a 10w7 in custom slot port and fried it so it's on it's way in to JL for warranty. But i'm planning on selling my 10w7 and getting 2 12w6v2's not sure on what kinda box yet. I also wanna add my JL 450/4 and add component's. I have a yellow top and anl fuse with soundquest wires. Also has anyone done a BIG 3 in our type of car? My question for that is should I upgrade the fuse in fuse box also?