This is an interesting comparison test between the Porsche Cayman GTS and its open-top sibling, the Boxster GTS. Both of them are powered by a 3.4-litre engine. However, the Porsche Boxster GTS, with an output of 330 hp and 370 Nm of torque, is 0.1 seconds slower to 62 mph (100 km/h) than the 340 hp and 380 Nm Cayman GTS.