And unfortunately for Honda, Porsche found out when the GT3 used by Honda was recalled back to the dealership to solve its connecting rod problems. After looking through the 991's black box, they realised that the car had hit a top speed of 329 km/h which prompted Porsche to leave a cheeky message for Honda under the engine cover.
According to the Project Leader of the NSX's vehicle dynamics, the message read "Good luck Honda from Porsche. See you on the other side". It was also reported that when the car was picked by one of the NSX's team, Porsche also asked Honda what track they were on when hitting speeds such high speeds.
Other than the 991 GT3, a McLaren 12C was also used for benchmarking purposes.