We alternate between a 928 and a 930. With European-spec horsepower, both of them fly, up the slope (it seems as steep as a stairway) at "Z" bend, sliding the tail wide for the photographer, then through the narrows to the banking at the south. On the long straight, as these street cars reach well up in top gear, there's time to check out the orchard that butts against the track on the west. The terrain falls away so that we are about mid-height on the trees. Then we brake hard to stay out of the engineering compound, arc under the bridge connecting the office area to the track, and power on down south again. When we return to the photographer's site, there's a serious problem. A prototype wandered by that wasn't supposed to be seen. It was not a Porsche. It did, however, make delicious V-8 sounds, although the version now in production has an inline engine; and it did have conspicuous camber in the rear wheels, whereas the production model has a solid axle. They want to know if a picture was taken. The photographer says no. Then, in almost pleading tones, we're told that confidentiality must be maintained. The engineering relationship with the customers absolutely depends on it. Which means that this testing ground called Weissach, so small it would be written off to infield at the GM proving ground, will be largely left anonymous. It has no shiny tools and towers inside to stand as monuments to Porsche engineering, and all but a few of the monuments on the out-side go about wearing other nameplates.