The type of HU and the type of system (Bose or non Bose) are two completely different things. Bose is the part of the system after the HU i.e. the amp and speakers. The Bose system works with any Audi HU Concert 2, Symphony or RNS-E, as does the non Bose system. The only difference is the EQ setting in the HU which is dictated by the wiring and a VAGCOM setting to turn on/off the Bose welcome when you turn the HU on, which is purely cosmetic.