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The only way we will be able to raise pressure is if there is excess pump flow available. We won't know if it will work until we run it. Unfortunately on the FA20 unlike the EJ there is no easy way to access the oil pump once the timing cover is installed.
I almost feel like Subaru did an "oops" and that second spring was a means to restrict the bypass without resorting to using preload like they do with the EJ pump spring.
I have a few tricks up my sleeve if this doesn't help but
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