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Calum if you're still understeering at -2.5 degrees camber up front try adding more, my car was the happiest it's ever been at the last autocross (so no corners above 40mph even) running about -3 degrees, I'm on stock everything else except tires (Z2SS OEM size).
Going to try -3.25 in a few weeks, it's not streetable, I adjust camber via my plates after arriving at the event and before leaving, I could feel the inside edge getting real hot after only a ~4 mile drive one day.