Cayman GTS 4.0 | 300 km/h on unlimited Autobahn & 100-200 km/h acceleration Acceleration & Sound by turboandstance - June 12, 2021 High speed Autobahn with our 2020 Cayman GTS 4.0 MANUAL! pumping out 400 hp out of that marvelous 4.0 Flat-Six (total weight: 1480 kg). As our car now has about 7.000 km on the clock it well run in and we wanted to check out if it really runs 300 km/h on the Autobahn. And yes it does, it easily reaches 293 km/h GPS speed and would likely be even a bit faster if they had had more Autobahn to go;) But please watch yourself and tell me your thoughts! Leave a comment