they all run the McLaren ECU now right? so why do they need a restrictor plate? can't they set the ECU so it doesn't supply more fuel than NASCAR wants available at a given RPM??? they all run the McLaren ECU now right? so why do they need a restrictor plate? can't they set the ECU so it doesn't supply more fuel than NASCAR wants available at a given RPM???Not sure about ECU, but I’ve been think the same thing since last year.