A connector system is provided for electrically connecting a receptacle printed circuit to a header printed circuit. The connector system includes a header assembly configured to be mounted on the header printed circuit. The header assembly includes header contacts. A receptacle assembly is configured to be mounted on the receptacle printed circuit and mated with the header assembly. The receptacle assembly includes a housing and a contact module held within the housing. The contact module has separate first and second chicklets that are coupled together to define the contact module. First and second receptacle contacts are held by the contact module and arranged in a differential pair. The first and second receptacle contacts are engaged with the header contacts of the header assembly. The first receptacle contact of the differential pair is held by the first chicklet and the second receptacle contact of the differential pair is held by the second chicklet.