ECUMASTER Plug and Play adapter for the Audi B5 S4 / RS4 allows for plug and play installation of the EMU or EMU CLASSIC standalone ECUs. All ECUs are sold separately. The Audi B5 S4 / RS4 adapter was developed on vehicles with the AGB and ASJ engine code. Customers have found other engine codes to be the same configuration. Please check the ECU pinout diagram your engine code to verify it matches the AGB/ASJ pinout before purchasing.