Glad to hear from someone with the 2560 and similar mods. I think I'm past over thinking this at this point. I'm into over over thinking it now. 620hp is a lot. I'm eventually going to do with E85 but right now will be on pump gas. What's your opinion on the responsiveness of your turbo in everyday driving conditions? I imagine it will be a little different on e85. Do you ever use 91 or 93 and notice a difference?
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