Unlock Stage 3 performance with an upgraded turbocharger system by APR Tuning. Currently offering Borg Warner K04.3 GTS Turbochargers for the Porsche 911 Carrera and Carrera S 991.2 platforms. This system works with your factory engine hardware, factory fueling, and factory emissions components. It even works with upgraded engine and exhaust components and picks up even more power with upgraded intercoolers.