RKX MOST fiber optic optical loop bypass Female adapter for Radio and Audio MERCEDES BMW AUDI PORSCHE Most optical test / bypass loop This is an invaluable tool for diagnosing / bypassing parts of the MOST optical system The most optical system is found in many European vehicles including Audi, Porsche, BMW, Volvo, Mercedes Please note that this connector will only bypass standard MOST connections. Some manufactures (mostly BMW and Mercedes) use proprietary connectors on some components. It is important to check the connection you want to bypass to make sure it uses the standard connector.