The model they take to the open road was actually on the low end, price wise, at the time it was made. But the completely unrestored 1958 Porsche 356 A Speedster is now worth six figures.
When Seinfeld bought it, people were dumbfounded as to why he would spend so much for a car that would require so much restoration.
"My whole point was it's perfect exactly as it is," he said. "It still runs strong, and it's got 99,000 miles on it so I'm going to be the one that turns it over."
Seinfeld said this is the kind of car that shows you, when you get into it, just how well-made it really is.
But taking a ride in Seinfeld's classic has extra sentimental value for Leno, who said, "This is the color of my brother's Speedster."
Leno's brother Patrick died of cancer in 2002. So taking this car out for a spin brings back some warm memories for Leno.
And the two TV stars couldn't have asked for a more perfect setting.
"The key to driving," Seinfeld said, "is having the right car on the right road on the right day and being in the right mood. You have four elements that made a great drive, and I think we've got all four today."