An NA car is always going to suffer more at elevation that’s just the way it is. You try running a mile at elevation and see how easy it is once your gasping for air. As for e85 vs 93 you’ll see bigger gains vs 91 than vs 93 but again at elevation I’m not too sure if it’ll be worth it since it’s the lack of air that’s your issue. At the end of the day I think you won’t be happy until your boosted so at least your exhaust is ready for it now.
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