Original rear silencer left side with sound generator for Audi A6, A7 4G This rear silencer is used as a replacement part for vehicles equipped with an active audio system ex works Selectable options: from model year 2013 - allroad (4G0 253 609 BG) up to model year 2014 (4G0 253 609 BK) from model year 2015 (4G0 253 609 BA) Note: Only suitable for vehicles with engine code CGQB, CVUA or CVUB