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Yes you can
for 4 speakers you need 2 of them the rear output rca you can use twice to amplify r...
I installed Waze on my S8 and it appears together with google maps as an option to select in the car. Waze is owned now by google.
I connect my S8 with cable to the car, select connection on the radio and android connects Bt is also connected.
https://rfsupplier.com/ they can make whatever you wish.
otherwise cut the cables and solder, but you must know which connector your new headunit uses.