Ebay GT45 + 5.9 Magnum + E85 blow thru

coreyg said

I'm just going off of what Bryce at fitech told me, said the reference should be coming from the carb hat.

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ok but think through as to why and it'll help you understand how the system is working.

Under boost there's nearly no difference. Its only at idle and cruise that there's a HUGE difference.