Board Thread:Game Discussion/@comment-33505716-20190708022456/@comment-35072544-20190708120737

Yop, since Bugatti update - v 7.3 - it was also mentioned in release notes (it's not bad to read them all ;) )

Quotation:

"Feature Improvements Miscellaneous
 * Added an additional tier to IMSA 2018 Season content with extended race distances"