Installing new Headunit!!

[4GIVEN]

I'm going to be installing a new headunit in a couple of days and I was wondering what do I need to install the new piece. I'm trying to keep it to where I can install the stock kenwood if needed without cutting all the wires up. I really dont want to mess up the stock wires. I'm also thinking about installing a pair of 6.5" pioneer rev series in the front doors. Does anyone have these and if so how do they fit. Hopefully they do fit :) Thanx for all you help!!!

[MrDiggler]

All I used with my Sony was the stuff it came with and a wiring harness adapter for the wiring. Pretty simple. Someone had already removed the stock Kenwood for me...