All Gr.4 US cars

Safety Car / Grid start (SC formation lap) / Available tyres RS, RM, RH, IM, W / Mandatory tyres RH (except for potential rain races) / BoP on / Tuning prohibited / Brake Balance on / Boost off / Slipstream real / Heavy damage / Tyres x5 / Fuel x4 / Time progression x6 / Weather random / Refuel speed 20 / Real grip / Short cut pen weak / Pitlane pen on / Ghosting off / Flag rules on
Rulebook:  https://docs.google.com/document/d/1c21JxXJBQwLZiUYvPbQk5EdgotDARCkOwE6WknGu1Jc/edit?usp=sharing