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Using the 87 Oc configuration? The stage 2 doesn't come with 87 software, afaik.
I believe stage 2 is designed to be best ran on 93.
Both versions run advanced timing and considering OEM timing requires premium (probably due to the lean fuel states which ECUTune resolves) I would think there is added risk to running lower grade fuels.
It may run just fine on 87, but the factor here is risk of ping.
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