At one point during our off-road experience in the Dubai Desert Conservation Reserve, Porsche engineer Jürgen Kern dropped me on a dune and I watched his technique. Roostertails of red sand plumed 15 feet from the wheels as he raced off behind a dune, reappearing moments later at the top. He dropped slowly down the face and the Cayenne plowed softly into the surface. As Kern gathered speed, sand poured from the grille like water from a sea creature emerging from the deep. The 2006 Porsche Cayenne Turbo S was totally in its element and, with an experienced driver behind the wheel, totally in command of the desert. It was amazing to consider that this was the same vehicle that, minutes before, was comfortably blazing along the blacktop at 168 mph.

The surface of the desert is not consistent – some places are soft and others firm. The trick is discerning between the two because if you slow or stop in soft sand you are sure to get stuck. Then you either have to be towed out or endlessly twist the steering wheel while in reverse and maintaining 2,000 rpm. It might take you 10 tedious minutes to crab-walk 20 yards to firm sand. Do this once and you will never get stuck again. Of course, the desert conspires against you and you do get stuck again despite your best intentions. We used the sides of long, sweeping dunes like the raised embankments on a race track, traversing long distances and then dropping down in a cloud of sand or cresting like a surfer cutting back against a wave. It was exhilarating to play in such a capable vehicle.

Back on the road with the tires refilled to 42 psi and Mr. Kern no longer aboard, I drove the Cayenne Turbo S back to downtown Dubai. On the return trip, I pushed the Cayenne to near its maximum speed only briefly, because I had no confidence in my ability to talk my way out of an Arabian jail. (I lack the sang-froid of Mr. Kern, who looked ready for anything in his cool shades, safari vest and desert boots.) Mostly, I cruised at around 100 mph and was regularly passed by Mercedes-Benz S600s, their drivers chatting into cell phones and dressed in white dishdasha robes and white gutras held on by black coils. I wondered if one or two of these were sheikhs from the Dubai ruling royal family, but maybe an S-Class is too down-market for those dudes.

Later, a red mid-1990s Ford Mustang GT sped up the left lane. Paint flaked off the old pony car’s corners where it was chipped and dented. As it got closer, I could see a white number 4 painted on the door. It pulled level and the passenger looked at me and the Turbo S and then the Mustang pulled away. Aftermarket louvers shaded the rear window. It was too much. Already doing about 80, I flicked the Cayenne’s Tiptronic gear lever over to manual and then kicked down to third gear. The roar of approval from the four-pipe exhaust was thrilling but nothing compared to the surge in power when I pushed the accelerator and upshifted via the paddles on the steering wheel. In a moment, I was traveling 130 mph and the flakey Mustang was a dot in my rearview mirror. It happened as fast as it takes to read that last sentence, but the tingling of unleashed adrenaline remained for a long time afterwards. It was a dramatic moment for me, but the 2006 Porsche Cayenne Turbo S seemed not to notice – just another moment in the life of an incredible piece of machinery.