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Yes, that "boost" you feel is vtec. Your cars ECU automatically adjusts the intake and exhaust valve timing to lengthen them, giving your engine more fresh air and allowing more time for the spent air (exhaust) to escape, which when combined with more fuel equals more power.
Air + fuel = power
Any time your increase the two your result is increased.
It automatically changes to vtec at 5,850rpm (I believe for the 05-06, not sure about the 02-04).
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2006 VBP RSX Type S
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