It could potentially have something to do with the thinner air at Collie? some 2-300m above sea level? i don't know, but from here I'll start swapping things and try eliminate it. Bit annoyed i didn't work it out as boost cut before now, i would have liked to have done some mroe laps..

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MY93 Impreza GX 1.8L, 0hp, 0nm