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A true E85 tune on an FI car makes a massive difference over a pump gas tune. Almost every FI car is knock limited, especially the high compression NA engines that have added aftermarket FI.
I would caution that you need to verify your injector duty cycle before moving to E85. I can say for a fact that a VT2-500 kit cannot run E85 without upsizing the injectors. I've heard ESS increased the size of their injectors on the VT2-525 kits they sell now, but I haven't personally confirmed. If you're looking to adapt this kit to a non-M, the VF kit on the 3.0i will run out of injector too. So... verify the injector duty cycle. Plenty of OBD apps are able to data log injector duty cycle.
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