On this week's episode of CNBC's "Jay Leno's Garage," comedian Jeff Dunham shows off his 2008 Dodge Viper ACR. What does being owned by the famous ventriloquist do to the car's value? Auto appraiser extraordinaire Donald Osborne sheds some light on the question.

Today, this kind of car typically sells for about $105,000. Five years ago, it cost $123,000 because people were buying it.

What's surprising, though, is how demand for the vehicle has dropped off. The Viper is high performance and limited edition, released in the same year as the first ever ACR. But it's not just any old American Club Racer. It's 100 lbs lighter than most. It's faster.

"It's a hardcore ACR," says Dunham.

What's more, it only has 454 miles on it. So, for Osborne to find any flaws to knock its price down, he has to be nit-pickier than usual.