HDCarsCollection Volume 2 gives you 8 highly detailed and shadered car models + additinal library of carpaint shaders (Vray 1.5)

All models are ready to render in Vray 2.0, just put them into your scene (every model was scaled to real world dimensions). You can easily change mesh resolutionwith meshsmooth modifier applied to car body.
Cars included :

Audi Q7
Citroen C6
Ford F-150
Lexus GS
Pontiac Solstice
Range Rover
Seat Leon
Skoda Fabia