Greetings.
The G-lader supercharger does need servicing every 20-25k miles, depending on size of charger pulley being used. You dont have to get your charger ported although it is done by most people for extra power. The eaton charger from the mini S can be used as they do not need the regular service intervals being a sealed unit and are good for 100k miles. Fitment kits were available from PSD but they've ceased trading and a company called AW tracksport did a kit, some problems with these have been found. I'm about to start an eaton conversion on mine with a PSD kit that I managed to source ;-)