Just trying to work out the pipework for that is giving me a headache.
What turbo are you running? Why not look for a more efficient turbo? Borg Warner EFR series are pretty well known for making very good power from low rpm.
Td04hl-20T, journal bearing unit to a Volvo/Mitsu design, pretty unbalanced as well given the small hot side relative to the large cold side.
I had considered a 3076R, but that's not going to lower the boost threshold appreciably.
@Hamham started
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Just trying to work out the pipework for that is giving me a headache.