NAV-TV Head Unit Replacement Interface Most-Hur-997 Integration Allows an aftermarket radio to be installed into select Porsche sports cars with the M.O.S.T. fiber optic amplifier. Retains the factory M.O.S.T. fiber optic amplifier, speaker, original sound quality and steering wheels controls if an Alpine or Kenwood head unit is used. Does not require aftermarket speaker, amplifiers and an expensive rewire of the vehicle. Includes a European to standard Motorola AM/FM antenna adapter.