I have the Avin Avant 4. Went with the 7" screen because it looks like the stock head unit. I had Nav like you and wanted to maintain a stock look. timmyc is correct about the ram. Get as much as possible. I got the IBUS app and dongle from Avin. Comes preloaded. Seemed simpler to deal with that way. I got the carplay, but I don't use it as it takes over and has to continually be shut off. Drove me nuts.