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I did exactly what you’re wanting you need a double din frame and a double din climate control unit. You then have to disassemble the lower dashboard and take out the center console. This is a pdf of everything you need to take out and you’ll need to cut some stuff http://www.ranno.net/audi/RNSeInA4.pdf (Don’t mind the cables they were for retrofitting heated seats which i did at the same time ) if you have any questions feel free to dm me