Fake Car Names Are Confirmed ( "Niko is driving a Black Comet", also the Stallion )
And R* won't get sued, they have to play for licensed cars ... Pay much money that should go for making GTA 4 better ... Plus, what company would want their car to be trashed/burnt etc. in a "killing simulator" ?
Driving an Infernus or a Lamborghini is the same, the car will be the same, why pay millions of dollars for just some real names when they can fake the names for free ?