2011 F150 FX2 Installtion HELP

[weatherf0rd]

Going to start off by saying I am a complete noob when it comes to car audio so bear with me. I have a 2011 F150 FX2 Crewcab. It has the Sony Premium sound so it already has a subwoofer and amp (not really sure on the size or watts). I am wanting to replace it with two 12" subs and a new amp. So I guess my question is since it already has a stock amp and sub can I use those connections when I install the new components? Or will I need some kind of harness to connect it to the stock radio?

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