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ok im sure everyone knows this but its not in the thread so ill say it anyways
Hp = (Torque x RPM)/5252
No theres not going to be a noticeable difference with only a header but there will be a measurable difference...However the more is already done to the engine the larger effect it will have.
What does it matter if an aftermarket one increases hp up higher and reduces it lower...all mods do this thats why racing engines have no power down low, thats why VTEC is such an advantage as its still drivable at low revs.
Half the reason for getting one is not for the performance anyway, its for the noise.
Honda could put better headers on fromt he factory but there will be very little benefit for them, it would give them very little extra power and it would lose power at low revs and become alot louder...this is not what the average consumer wants, especially on somthing like a DX or EX where they were never designed for performance.
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