Turbo oil feed restrictor

Hi, what’s the feeling on Turbo oil feed restrictors?
I’ve got a ball bearing water cooled RHB5 on a EF-JL that’s currently got no restrictor in the feed line, should I install one, If so what size ?
Is running unrestricted affecting my oil pressure by providing a path of least resistance to the sump? Cheers

According to Garrett Motion, a restrictor is required on a ball bearing turbo.

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