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There's always going to be a boost dip around 4000-4500rpm. This is caused by a valve timing phase shift at often occurs right here. Totally normal. And the colder it gets, the lower boost you will see. Especially during the first (of several) runs when intake temp readings are the lowest. It never really gets below 50F here so I can't speak from firsthand experience when temps drop to freezing levels.
shiv
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