Car Design Programs

car designing?
does anybody know any car designing programs.. like in 3d (like c.a.d.)
Both the programs Autodesk 3D Studio Max and Autodesk Maya are high-end 3D programs, though they are not exclusive to car design. There are many user-created car models out there on the web, in formats for each of these programs.
Concept Car Design using 3ds Max and Mental Ray_CFD analysis using Ansys CFX