I currently own an IS350 and want to switch to a Z. The only problem is I want base.... with OEM nav

. I dont know how it is with the 370 (my reason for asking) but, on the IS350 there is a company called flyaudio that makes an OEM navi swap set up. I wish I could just put my lexus navi in the Z

. I just absolutely hate aftermarket navis any help would be appreciated. So that being said what would have to be done? would it even be worth it or should I just

that idea away right now?