2015 quad cab alpine equipped truck. So over the next two weeks I’ll be upgrading all factory speakers(besides dash and sub for now) and installing some dynamat. Im wanting to redo everything and add two subs with everything amplified by after market amps. My brother is in between steroid builds while he restores a 79 bronco. So he is letting me borrow his amps. All I really need is an enclosure, 2 subs and the wiring. Now I know I will need an interface like this pac audio one. My questions is, once I install it can I just unhook the factory speaker connections and hook up the aftermarket amp connection? Will this mess with the signal the pac interface will receive? Normally it’s aftermarket hu which makes amping a car easy compared to this truck. I want to keep stock head unit cuz I like all the functions it provides. Mainly the gps and internet. I’ve searched and I can find where people install them in these truck but never a clear cut answer to my questions. Any help would be awesome.