MULTI-CLASS RULES
GT3:
GT3s will inevitably lap the GT4 class. When passing, GT3s need to exercise caution and not bully the GT4 cars by divebombing or expecting the GT4 cars to move aside. GT4s are entitled to their line, and are not required to move out of the way of GT3s.
GT4:
As a GT4 driver, you are entitled to your race/line, and need to be predictable so GT3's can get around you safely. However, you may move out of the way of a GT3 if you wish, as long as it is done with plenty of time for the GT3 driver to react. With the speed differential between the classes, it is imperative GT4s make it obvious ahead of time where they intend to be on the track.