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Re: header question
With something like a header or exhaust, you notice the most benefits from doing the whole thing, intake, header, exhaust... Together they all help to allow the engine to flow alot better... Not to say u wont notice anything with one or the other... But the combo of all make it that much more noticable... On a stock D15B (unless its the JDM D15B VTEC), u wont notice much... And with the money it would cost to buy all those parts, it would be much more worthwhile to just swap the engine...
As for sound, the most noticable sound was my intake... And then when I got my mid pipe replaced (custom 2.25" pipe from my cat to my axle back)...
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