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In principal the maf scales should be same regardless of e85 petrol or type of header. As the maf is just measuring air flow into engine. Maf should only change if intake changes
I suspect the oft guys may artificially add to the open loop part of scale in some tunes to ensure they always run on the rich side, this is safer than lean as its a one tune for all
If your runnig richer than commanded afr then coreect that with maf scale
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