I saw a little segment about them on "Modern Marvels: The Autobahn". Their main shop is on a remote stretch of unregulated Autobahn. All the cars they build are top speed tested there. The one on the show did 212mph with 2 camera guys in the car! I want to say that they're in the guiness book of world records for fastest speed on a public road at ~231mph.
Since we have no autobahn, I guess a remote area of Texas is the next best thing.
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