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Here are a couple charts and the corresponding exhaust mods and octane):
(First one my car w/ full Full Akra (91) , Second one Catless Car in Australia (98 RON), Third one stock exhaust (93):
Blue line on first chart is a bone stock M3 on same dyno.
Second dyno is before/after tune - so you will not see any gain from the cat removal on the chart.