Is the Porsche 718 Cayman GTS still not enough to get your blood pumping? If that is the case then there's only one car that can perhaps satisfy one's craving for performance, the 718 Cayman GT4. Lighter and more powerful than any Cayman on the road, the GT4 packs a mighty, naturally-aspirated flat-six that produces over 400 PS. Only a six-speed manual gearbox can be paired to this lightweight sports car from Porsche.