In modern gasoline injection system where does the fuel injector spray gasoline?

In modern gasoline injection systems, the fuel injector sprays gasoline directly into the intake manifold or directly into the combustion chamber, depending on whether the system is a port fuel injection (PFI) or direct fuel injection (DI) system. In PFI systems, the injector atomizes the fuel as it enters the intake manifold, mixing it with air before it enters the engine cylinders. In DI systems, the injector sprays fuel directly into the combustion chamber under high pressure, allowing for more precise fuel delivery and better combustion efficiency.