This is strictly a connection to your OBD port. No need to remove the ECU. You only remove it if you have to send it to someone for the programming. Most performance shops, specially the ones that work on Porsches, Audis and VWs provide this service. I found 3 shops that provide APR tunes within a 15 mile radius in my little town of Charleston, SC. They download the software directly from APR and install it to your vehicle via OBD port. I've had this done to two previous GTIs, Cayenne , Touareg, Audi SQ5 and Q7. Vehicles were completely trouble free and some even got better MPGs from the ECU tune.