ayovaccaro

Hello everyone, I'm new here so forgive me if any formatting or tagging is wrong. I have a question about installing an aftermarket Navigation system in my 02' es300. I recently bought a Pioneer DVD Unit from Best Buy, (I work there so I got a killer deal on it) and one of the Geek Squad auto tech guys is going to install it for me as well as some pioneer 6.5" and my amp and sub. My question is would I need to buy any aftermarket kit for him to install it? He seems to think I need a replacement dash kit, but my car already came stock with the Navigation in it. Has anyone used this head unit before or know if the dimensions will correctly fit the current dash kit? Sorry for slight wall of text just wanted to make sure I covered everything I needed to know, Thanks in advance!
TL;DR - Will aftermarket Navigation unit replace current factory Navigation without any aftermarket install kits?

028

you need Metra tyto01 harness,PNG,just need to connect power,acc,gnd,amp wires and stereo back light wire to acc.