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I searched and found that 4 gauge wire is the correct size but what kind of connectors do I use if I'm trying to extend the power and ground cables that connect to my battery? So a connector connecting stock battery cable/wire to my new battery cable/wire. Thanks for the help.

I was considering the JL Audio Master Fuse Block - XB-MFBU-ANL.

Link:

http://mobile.jlaudio.com/products_c....php?cat_id=11

 
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Couldn't you just cut and solder? Or wrap with electrical tape.

 
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Worse advice ever!
This isn't a little wire we're talking about. It's 4 gauge! If you haven't seen it, it's the size of your thumb. It's unsafe and impractical for a wire this size to be snipped and taped. You'd be better off buying that fuse block. It'll serve two functions for the price of one: To connect your wires and protecting your equipment with the fuse.

 
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agree, that thing you posted looks like it will work fine.

 
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I have that exact fuse and it works like a charm. I ran my positive 4 gauge wire through the passenger side grommet and then hid the fuse behind the small lower panel next to the door. I then ran it to a distributor block that split into 2 8 gauge wires for my amps. Very easy and clean if you are willing to take off interior panels with the wonderful DIYs on this site.