No changes to be made to install it, unmount and mount the original as it is our perfectly interchangeable with the original "Plug and Play".
If you do not want to turn on the light engine, due to the removal of the catalyst is necessaryreprogram the ECU by removing the control of the catalyst oradd an accessoryMinikat(Not included in base price), which allows this engine does not turn on at 100% light engine failure.