AutoTecknic Carbon Fiber Door Sills - Porsche 991 Carrera ModelsProduct Description Technical Specs From the factory Porsche uses plastic door sills on the 991. To remedy this issue we created a solution carbon fiber door sills. Instead of seeing the plastic every time you get in your 991 you can upgrade to our carbon fiber door sills to enhance your 991's interior appeal. You will notice our beautiful carbon fiber pieces every time you open the door and you'll appreciate your 991 even more! Our carbon fiber door