Field In Sight,
It is actually a very rare car indeed that, at the moment, injects fuel directly into the cylinders, the Mitsubishi Gdi engine being one example. Car engines started out with single point injection (injected before the manifold splits to the cylinders) and then moved onto 1 injector per cylinder, but this is still generally done on the manifold.
Diesels on the other hand tend to inject directly into the combustion chamber.
The real mystery is why there are so many carburetted engines still about, surely a kit to "injectorise" them would sell?