Chaves was the only driver to complete the season , as Storey was replaced by Tom Dillmann after two rounds of the championship .
Vittorio Ghirelli took Smith 's seat for the final round .
Chaves was the only driver to complete the season , as Storey was replaced by Tom Dillmann after two rounds of the championship , and Vittorio Ghirelli took Smith 's seat for the final round .