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I would get a HP tuner set up or something similar to data log your runs. With the lack of top end MPH I would think you are pulling timing. AFR could be an issue but usually when you're losing power its because of pulled timing. It could be from kr or it could be from the intake temps. Either way that should be something that should be cleaned up in the tune. Try some 100 octane, if you're getting knock that should clean it up.
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