Passenger side: Just below this sizable air guide/duct you can see the opening to the ducting I just added. Interestingly enough, the Carrera GTS come from the factory with both front and rear ducting and liners from the 997.2 Turbo. That' what you are looking at here. This is another thing that separates it from the standard C2/4S. Realize this pic was taken with the carrier extended. When the carrier is under load both ducts are in line with the longitudinal axis of the car.