Oh, as for the wires. I would reccommend running new ones for the sake of simplicity and conformity. If you use an amp for you speakers, you WILL have to run new wires. If you are plugging your new deck into the factory harness and just running the speakers off of deck power, then no. In that case, cut the connector off of the factory speaker plug an solder or crimp one on that fits your new speakers. I like running my own wires because they are easier to work with. Plus I FEEL like it should sound better because I spent so much time on the install... More satisfying!!!