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If it isn't detonating, higher octane won't help. Most likely, it'ss start missing unless you have a boost controller that can tell it's missing and kick up the turbo a bit to increase the pressure. I'll bet that your engine ins't designed to run nitro or leaded fuel anyway. You'll just fuck up the cat(s?) that way.
On a side note, this reminds me of a contest from hot import nights a few years ago. They wanted to see whose car could run the highest octane, and around 130, all but one had dropped out. The one guy left had an Integra with huge amoiunts of bottom-end reinforcement, and kept turning the boost up until the trubo couldnt' put out any more air. I think his final number was 174
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