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I'm going to say it's in your head. How you work the clutch and gas when shifting has more to do with chirping tires than power.
As far as reaching higher speeds in a given time unless it's clocked at a dragstrip you probably aren't accurate.
What octane do you normally run? Maybe they reset the ECU and filled it up with premium. Of course if you run 93 there shouldn't be much of a difference.
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