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We have done e85 on stock injectors no problem. We recommend the injectors and pump because it gives you more headroom. You have to bear in mind that we were not contracted to develop a CARB tune, so for this reason we can customize things to whatever people have.
70 on pump non-intercooled on 93 works. 91 stick with the 72.5 or 75mm. On e85 the 70mm really shines....you just need enough ethanol in there to cool the charge down, so in reality even e30 is enough to see the gains from the 70mm. Currently I'm finding myself between e40-e60 running flex fuel and it is super quick just on that. E85 is more HP on but on the 70 that's pushing the stock clutch right now.
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