Adding another amp and sub to 02Denali?

I'm looking to add another amp and sub to my denali. Can this be done with everything still hook up? Do i need a split on the amp to run another rca jack to the other sub?

If it is the same sub and amp as the others, you can use RCA splitters. Personally, I like to use amps like those from DEI that allow you to dasy chain amps together for this setup.

This will be a Kicker amp and sub. Anyone got picture of the stock amp? What kind of output it's have? Can i just get a Xover and connect my other amp?