Yeah, unless you have set up your car to up the boost, higher octane gas will hurt more than help. Plus, Mitsu will be more than happy to void your warranty if you race it. Also, read the fine print carefully, because they may possibly void it if you simply turn up the boost.
Also, doesn't teh Evo come stock with something close to 19psi boost? If so, im not sure how much more i would really trust the engine to handle, or how much more the turbo could even put out.
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Dont cry kid, It's not your fault you suck.
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