Installing a set of JBL GTO components this weekend. Do I need the Metra connector, or do I just snip off the factory connector? If so, which wires go to the crossover? Adding on, do I wire from the stereo to the crossover, and from the crossover to the tweeter and the door speaker? I want to make sure I have all of my wires and such ready to go so I'm not waiting for parts.