A connector system includes a first connector comprising a housing holding a plurality of contacts, a second connector comprising a housing holding a plurality of contacts, and a metal shield having walls defining a shielded chamber. The first and second connectors are configured to be mounted to a circuit board in a stacked arrangement next to one another. The first and second connectors are configured to be arranged in a shielded configuration in which the first and second connectors are positioned within the shielded chamber and mounted to the circuit board with the metal shield. The first and second connectors are also configured to be arranged in an unshielded configuration in which the first and second connectors are mounted to the circuit board without the metal shield.