The claimed top speed of the Porsche Boxster S 981 is 173mph or 279km/h After 50,000 miles, can it still achieve that top speed? There's only one way to find out - watch this video I didn't actually intend on doing a top speed run, but the opportunity presented itself to me, and I just took it. Note that the autobahn has no speed limit and that I kinda know how to drive - I used to be a kart champion, and I do a few track days each year - I wouldn't recommend someone inexperienced trying top speed runs, the car feels a lot less stable at these speeds.