What do you do when a pair of shiny Porsches arrives at your door? Dan Neil judges his own 911 show-down and tries real hard to keep to the speed limit.

THE PANDEMIC has been a disaster but the important thing is, Is Dans supply of test cars safe? Yes. In fact, the cancellation of the spring auto shows resulted in a number of flamboyantly costumed models showing up unexpectedly at my house, like showgirls who missed the bus.
Porsche sent along two: A new 911 Carrera Coupe, which I reckon will be the last of these delicious sports cars with a starting price under $100,000, if barely; and the new 911 Turbo S Coupe, fitted with active aero, AWD, icky-sticky tires, and 640…