It's week four and the contestants are preparing for a new round of challenges...and for our eight remaining rookies the elimination room looms. As the drivers arrive at the Supercar Showdown race track they realise Todd Kelly is not standing next to his brother Rick -- instead it's a celebrity guest judge and Australian Motor sport legend...Who will it be? And in a shocking twist this week, the poorest performing team are asked to step forward. Will two people be sent home tonight?