I am thinking about getting the F500BT to integrate into my 2007 Honda Civic Si and had a few questions. First off the car currently has a factory amplifier installed. I was set on getting the f700 for a while, but I think i want to keep the factory look on the dash. My first question is on the installation, Is it as simple as hard wiring the power (probably through an add-a-circuit) and plugging an aux cable from the f500 to my aux port? I know there is a pioneer amp that goes along with the f500, but do I need it if my car already has a factory amp? I looked at the harness for the unit