well i'm no expert, but if you wanted to attempt to do 450 on pump gas, I believe you would need meth injection on top of that 90 octane, and probably a lot of it. Don't know if it's wise to mix leaded and unleaded gas, but I guess that's probably how people get 100 octane average for HOM. C16 is 116 octane. They make C17 but as far as I know that's really just for heavy nitrous use, like if you were spraying a nice 250 shot on top of everything. I think you'd be fine with 90 octane if you had meth and got it dyno tuned as long as you keep boost at like 18 and don't try to push it. but that's my unprofessional opinion :/
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