Audi A2 2005 - 2005 For Vehicles With BOSE Amplified System. This adapter is designed to match the correct impedance of the vehicles speaker system. Audi A3 2005 - 2012. Audi A4 2005 - 2008. In these cases it is necessary to manually connect a spurred live feed fromfuse box for example to feed switched power so the new stereo turns on and offwith the key.
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