well at least vaughn has asports car allthe rest are real crap.
Apparently it's a v6.
Some of their rides are cool in one way or another...Clint Eastwood's truck is a Typhoon, for example.
I remember seeing somewhere that before she made it big, Jessica Simpson (I think) had a turbo Eclipse, and they mocked her for it.
In a nutshell, Hollywood is obsessed with image, so if it's not shiny and expensive, it's crap in their eyes.
However, in some cases, it is really odd to see millionaires driving around in boring, common cars.