I have a 2015 A8, which I love, but not the voice command. I would love it if I could use Siri or something similar. Is it possible to modify the existing electronics?

 

i think it is not a big tec problem to install a apple carplay on a audi A8 now even it is old edition as long as it has MMI3G or MMI3G+ editon mainunit,
i see some sellers has made it and seems not bad,the whole carplay solution check Guangzhou Icarplay Commercial & Trading Co.,Ltd
as i know all audi A4 A6 A7 Q7 they have installed it works well