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Used to set my 18s" at 35/33 f/r as recommended by Mike Wood - lightened steering but you could feel every pebble and wore the track centres away for being slightly over-inflated.
Car came back from dealer service one time and ride was a lot better - asked them what they'd done and they said to set the pressures to those on the b-pillar, i.e. standard pressures of 33/32. This is for an MY05 STi.