In a second letter, also dated June 18, Dupasquier and Shorrock confirmed that they would not permit their teams to race on the Michelin tyres used during qualification without changes to the circuit, and reiterated their request to slow down Turn 13. Whiting's brief reply maintained that no such change would be permitted, and gave the teams the choice of limiting speeds through Turn 13, using tyres of a different specification to those used in qualifying, subject to a penalty, or changing tyres repeatedly, which would have been permitted if a driver's safety were at issue.