The cabin of the 991 GT3 RS is focused entirely on driver ergonomics, frequently specified from the factory with carbon fibre bucket seats. For vehicles equipped with standard sports seats, or for those requiring dedicated motorsport homologation, installing fixed-back Interior Parts (Racing Seats) decreases overall vehicle mass while holding the driver firmly in place under intense cornering forces. Proper lateral support improves steering accuracy and pedal modulation by eliminating the need for the driver to brace against the steering wheel.