Luquire

I think SCOSCHE NN03RB would work but not for sure and dont know a good place to get it from. I am trying to connect an amp to my speaks but i dont want to get a new head unit and i dont want to cut all the wiring. Is there a good way of doing this without cutting all the wiring up or should i just bite the bullet and cut away or even bite the bullet and save up for a new headunit and the GXE install kit. I have infiniti speakers all around and a kicker sub that hits pretty damn hard.