I absolutely want to stick with the RF upgrade, even if I have to wait. Thanks for the advice … I’m going to reach out right now.It apparently has been on a national back order due to the chip shortages. I would contact dealer parts guy Benny from Subaru Online Parts in his forum section and ask if there is an availability date. The part number for the RF upgrade should be H630SFL002 . You can buy aftermarket stuff but this comes with a nice plug and play harness to the amplifier under the passenger seat.