EMU Black INJ7/INJ8 flyback diodes

Hey,

Are flyback diodes needed for AUX1 and AUX2 for injector control? Only under “Fueling - injectors phase” help file does it mention that “It is possible to assign AUX1 and AUX2 as an injector 7 and 8. Those outputs have no flyback circuit to allow injectors control.” But the car runs better without any flyback diodes. If they are indeed needed, what diodes would be recommended?

Thanks in advance.

no aux1 and aux 2 are without flyback and injectors has to be without flyback