in the firmware, the control of catalysts is disabled (Euro 2) and chip tuning is done with an increase in power and torque by 10%. Connectors from the lower oxygen sensors (after catalysts) can be removed.
The DPF particulate filter, the EGR valve and the throttle valve TVA are disabled in the firmware (you can remove the connectors from the black filter sensors, the EGR valve and the throttle valve). Firmware in the format of calibrations for recording Kess2 through the OBD connector.
DPF particulate filter, exhaust gas recirculation valve are disconnected in the firmware (you can disable disconnectors with particulate filter and EGR sensors) and make chip tuning with an increase in power and torque by 20%