XTRONS Optical Fiber Decoder Box Designed for BMW E39 / E46 / E53 / E90 / E91 / E92 / E93 •Description:*If your car has Logic 7 system or the factory car radio plug has fiber optic input WITHOUT 8 speaker wires as shown on the right ,you need this decoder box for installation.*If your factory car radio plug has 8 speaker wires as shown on the right ,then you do NOT need buy this decoder box.
