Oh yeah, I made Killbane's infuego from Morning stars infuego ^^ I'm pretty proud for the first time I customized a car x)
Ok, got it! So, for now, there is absolutely no way to get old vehicles back to SR4? Not cool.
You know nostalgia...
EDIT : But as SR3 and SR4 share practically the same engine, well...the same-everything, isn't this easier to convert things from 3 to 4?
Wait for the SDK