triplechanger

Considering it will be over 7yrs old will I be covered for Crack dash? If I get a rx350 with nav and regular radio, can I replace the radio without affecting the navigation? It would be very nice to have 2 screens. I would really like to add a pioneer nex radio. Will the plug and play harness allow me to use the pre out or the speaker level out from the radio. I assume the factory radio is non amplify because there is a factory amp at the back. I notice many different plug and play kit on ebay. Which size screen fits better? My pioneer d3 which is a 6.2" screen fits perfect in my 98 es300 and 02 4runner.