From memory its a 3/8th grub screw. I have bag full of them left over at home after we did mine, staces, ballstics. I also bought a good tap & die kit. So while this "cost" me more than $10, its about $0.60 for the actual part.
and yeah, noticeably snappier throttle/boost response. Will try find the exact part tonight
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MY93 Impreza GX 1.8L, 0hp, 0nm
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